Hi KingSpore,
The mattress you linked would be good value compared to other similar mattresses but I would want to know the density of the foam layers and it’s likely that they would be in a lower density range than the guidelines I would suggest for a memory foam mattress (see post #4 here). I would choose a mattress with memory foam that was 4 lbs or higher unless you have no other options or unless durability isn’t as important a consideration.
Phoenix
Okay, I’ve read more and went to a few stores and realized a few things. I first went to lay on mattresses and didn’t really pay attention to names or anything, just to see what I liked best. I ended up liking basically all of the memory foam beds, but I strongly prefer the softer feeling ones. Of course, I ended up liking the most expensive tempurpedic one there the best, but it turns out that it was the cloud luxe, which is supposed to feel like the dreamfoam 13 inch ultimate dreams. So based on that, and of course the recommendations, research, and advice here, I think that is the mattress I’m going to go with. Is it a mistake to compare it like that? I’m pretty sure that even if it doesn’t feel exactly the same I will be happy as long as it is fairly soft.
Hi KingSpore,
That’s certainly the first step involved in comparing an online mattress to one you have tested in person. The first part of comparing mattresses is PPP (Posture and alignment, Pressure relief, and Personal preferences) which is about what you feel on a mattress. The rest of the comparison would be based on the quality of the materials. If you are confident that the Tempurpedic Cloud is a good “match” for you in terms of PPP then it certainly makes sense to compare online mattresses that are similar in terms of PPP and the other parts of your personal value equation that are most important to you. There is more about “matching” one mattress to another in post #9 here that you can also use as a reference.
Most of the feedback about the Dreamfoam 13" memory foam mattress indicates that it has a very similar “feel” to the Tempurpedic Cloud Luxe except perhaps just a little bit firmer although of course different people may have different thoughts and opinions about how two mattresses compare.
Phoenix
Hey Phoenix. I going to dig this up because I recently purchased a king size model of the very same 13" Brentwood Gel Foam the OP was asking about, and ultimately, after being a bit disappointed with the overall construction and comfort level, spent the past few hours (before ironically running across this thread) following the very same whois trail you obviously did, and also came back with pretty much all of the same information (and screenshots of it) that you did in regards to their importing practices. That said, here are my primary concerns…
They are advertising that this particular line of Brentwood mattresses are “Made In The USA”, which, given their importing practices, if they are indeed not “all of virtually all” made of US-sourced foam, this stands to be a decent FTC violation. I did, however, see a horizontal and vertical foam cutting machine on one of those bills of lading, so that throws another variable into the mix.
None of the companies you noted (SleepShop, BRK Group, or SilverRest) are on that CertiPUR-US list, which coincidentally, would make perfect sense if they are indeed importing their foam. Additionally, if that’s the case… more false advertising practices.
While I’m usually a research fanatic (to a fault at times), I pulled the trigger based on price and overall Amazon reviews and price (which was $479 OTD at the time I bought it). I also, however, do not like being misled or lied to, and with the circumstantial evidence I’ve now seen regarding their potential manufacturing processes, I’m wondering if that’s not the case. If so, God help them. 
Anyway - any additional insight you might have or be able to provide would be appreciated, and feel free to read my detailed (and lengthy) review on the 13" model on Amazon, under the same alias as my user name here. Thanks in advance!
Hi dzignr_tastz, i took a look again through registered trademarks and some things have changed. BRK Group used to be the owner of SilveRest but is no longer. Apparently they let the trademark expire and SilverRest Sleep Innovations is the owner of the Brentwood brand. Not knowing the details, maybe the company consolidated, maybe they split partnership from BRK Group etc. I’m not sure of the details of ‘made in the usa’ qualifications, but seems like many materials can be imported with very little final fitting done here in the usa and qualify as ‘made in the usa’. For all I know, that could mean they import the foam, cut it to size here and wrap a mattress ticking around it here. Not being on the certipur-us list doesn’t instantly mean they’re imported, there’s many certipur-us foams that come from overseas. They could be using a certipur certified supplier for the foam, if the company is going through changes (such as breaking away or dissolving the BRK Group ownership of SilverRest). I would think if a company for instance decided to use FoamByMail (much as they’re disliked, they’re certified), construct a mattress and it would be certipur-us certified. (Unless the details stipulate it has to be certified as a complete mattress assembly and individual foams used in construction doesn’t count).
Things like mattresses and foams are big business and a quick look around a place like alibaba (where items can be imported by the hundreds if you’re in a position to import and order in large quantity) - you’ll see a LOT of familiar looking products. From velour zippered covers all over ebay/amazon to more popular 4 way stretch knit zip covers, typically selling for $60+ and come to find out they’re $12 a piece with a min order of 200-2000 pieces. Of course there’s also shipping fees, duties etc I’m sure.
I’m wondering if they never were on the certipur-us listings, or if they’ve been dropped due to branding change and are resubmitting. It wasn’t that long ago, maybe a few months when I was doing research that the SilverRest brand was an active trademark belonging to BRK Group and now no longer does.
Another quirk I noticed when searching, maybe they’ve since combined but there seems to be a ‘certipur-us’ and a ‘certipur’ (european) label. When attempting to go to one of the certipur websites, it was broken. Certipur-us works and europur works, but not plain certipur (without the -us). In some places I noticed the Amazon ad said “certipur”, in other places it said “certipur-us” so who knows. Amazon ads aren’t known to be the most accurate, subject to mistakes and typos. Maybe the seller wasn’t even sure (sad, but it happens) which one it was.
Unfortunately a lot of advertising is hype and spinning things. That Brentwood mattress also says it uses natural bamboo for the cover. Bamboo has become a huge rage in mattress and topper covers, and I’m sure some of it may be from natural bamboo. A lot of it is rayon made from bamboo fibers and there have been mentions of companies like amazon, sears, kmart, macy’s etc paying fines for selling mislabeled products. Passing off rayon as ‘bamboo’, since apparently the rayon process is such an intensive one (and not very ‘green’) that little to no benefit exists from the bamboo any longer in rayon form. Maybe mattress tickings are part of the exception, but the national resources defense council states natural bamboo linen is ‘green’ but it’s seldom seen due to its’ labor and cost. If this applies to mattress ticking, then it would be hard to imagine a budget mattress using materials that are costly and labor intensive.
Everything has become confusing with word play - 100% latex, 100% natural latex, natural latex, organic, natural, certified organic, manufactured in the u.s. vs made in the u.s., you name it. Used to be everything meant what it said, it was either organic or it wasn’t. If it was made in the u.s., it either was or it wasn’t. Not so much now days.
Hopefully Phoenix can clear up any issues with my generalizations if I made errors, it’s so deep it could be a career all of its’ own. I’m by no means a trademark expert or expert on corporations, licensing, certifications or anything else. Just a casual lay person trying to make sense of it without falling all the way down the rabbit hole. I didn’t bring a long enough rope 
Hi dzignr_tastz,
One of the challenges of some “made in the USA” claims is that the mattress may be assembled in the USA but the materials are imported from elsewhere. It’s certainly possible that foam buns are being imported from China that are being slit and assembled into a mattress in the US. SilverRest is also a licensee for King Koil which is a top 15 manufacturer so it wouldn’t be unusual that they would be importing a foam slitting machine. It would be interesting to look at the law tag on your mattress to see what it says.
There are a few Chinese foam manufacturers that are on the CertiPur list and your post led me to take a look today and the company that was listed in the import record (Shanghai Gaoyu Foam Products) is now listed on the CertiPur list under Glory Home Furnishings* (they weren’t listed the last time I checked a few months ago). Having said that they are listed for viscoelastic memory foam not gel memory foam or polyfoam which are separate categories.
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Of course this says nothing about the quality/density of the foam and I would want to know the density of all the layers in any mattress I purchased.
I think that one of the biggest difficulties with this type of research that leads to Chinese sources is that there are so many uncertainties involved and so many dots to connect together that it can be very difficult to find out accurate information that you can verify. In these cases the approach that I generally take is that I treat the high level of uncertainty itself and the lack of transparency as a risk factor which means that finding out reliable and trustworthy information (such as foam density) would become even more important.
Sometimes a member here will connect some dots that leads to a new trail (such as in this topic about a foam supplier that I was never able to find out where they sourced their polyfoam or memory foam) so if you do find out any additional information it would be great if you could post it here.
Phoenix
Thanks for the replies, as they did shed some additional light on the situation.
For a quick update (primarily on the “Made In The USA” topic… direct from the FTC website:
Introduction
“The Federal Trade Commission (FTC) is charged with preventing deception and unfairness in the marketplace. The FTC Act gives the Commission the power to bring law enforcement actions against false or misleading claims that a product is of U.S. origin. Traditionally, the Commission has required that a product advertised as Made in USA be “all or virtually all” made in the U.S. After a comprehensive review of Made in USA and other U.S. origin claims in product advertising and labeling, the Commission announced in December 1997 that it would retain the “all or virtually all” standard. The Commission also issued an Enforcement Policy Statement on U.S. Origin Claims to provide guidance to marketers who want to make an unqualified Made in USA claim under the “all or virtually all” standard and those who want to make a qualified Made in USA claim.”
Thus why I quoted “all of virtually all” in my OP.
What is the standard for a product to be called Made in USA without qualification?
For a product to be called Made in USA, or claimed to be of domestic origin without qualifications or limits on the claim, the product must be “all or virtually all” made in the U.S. The term “United States,” as referred to in the Enforcement Policy Statement, includes the 50 states, the District of Columbia, and the U.S. territories and possessions.
What does “all or virtually all” mean?
“All or virtually all” means that all significant parts and processing that go into the product must be of U.S. origin. That is, the product should contain no — or negligible — foreign content.
What factors does the Commission consider to determine whether a product is “all or virtually all” made in the U.S.?
The product’s final assembly or processing must take place in the U.S. The Commission then considers other factors, including how much of the product’s total manufacturing costs can be assigned to U.S. parts and processing, and how far removed any foreign content is from the finished product. In some instances, only a small portion of the total manufacturing costs are attributable to foreign processing, but that processing represents a significant amount of the product’s overall processing. The same could be true for some foreign parts. In these cases, the foreign content (processing or parts) is more than negligible, and, as a result, unqualified claims are inappropriate.
Example: A company produces propane barbecue grills at a plant in Nevada. The product’s major components include the gas valve, burner and aluminum housing, each of which is made in the U.S. The grill’s knobs and tubing are imported from Mexico. An unqualified Made in USA claim is not likely to be deceptive because the knobs and tubing make up a negligible portion of the product’s total manufacturing costs and are insignificant parts of the final product.
Example: A table lamp is assembled in the U.S. from American-made brass, an American-made Tiffany-style lampshade, and an imported base. The base accounts for a small percent of the total cost of making the lamp. An unqualified Made in USA claim is deceptive for two reasons: The base is not far enough removed in the manufacturing process from the finished product to be of little consequence and it is a significant part of the final product.
Now given those further excerpts (and specifically, the second example in the last section), I can only assume since foam undeniably makes up 95% of the final product in a mattress, if said foam (and probably the cover, to make up the last 5% - LOL) is indeed imported from China, then regardless of the fact that it may be cut and the layers combined in the US, it in no way qualifies as a “Made In The US” product when all is said and done.
Opinions?
Hi dzignr_tastz,
I think that the “made in USA” definitions are fairly clear with only a few slightly “fuzzy edges” so it would really be a matter of confirming with a good degree of confidence where all the foams inside their mattresses were sourced. It’s even possible that some of the foams are sourced in different countries.
Did you happen to look at your law label to see what it says?
Phoenix
One better. I took pics while rotating it for the first time…
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I’ll let them speak for themselves pending comments.
Hi dzignr_tastz,
Thanks for the pictures … I appreciate it 
The production date on the law tag indicates that the mattress was manufactured on July 15th. 2014 so at least you know that the mattress was likely assembled in the US and wasn’t compressed during a shipment from China or in storage for a longer period of time which can affect foam durability.
The law tag also says “Made in USA” so that’s promising as well.
All that’s left (at least that I would want to know before buying any mattress) is to confirm that the foam materials are in fact manufactured in the USA or if they aren’t that they are CertiPur certified and more importantly to find out the quality/density of all the foam layers to be able to assess whether the mattress has any weak links in terms of durability and so you can make more meaningful comparisons to other mattresses.
Phoenix
OK… here’s one of my concerns with the whole thing (besides the obvious tear in the ‘cheesecloth’ surround, which was not of my doing although I did take the opportunity to take a peek at the layers as you can see). The tag also says it is a “Brentwood” mattress that was manufactured by Springfield Mattress, which is associated with SilverRest, both of which are associated with BRK Group, and SleepShop is a ‘company’ with no website but just an Amazon presence that sells multiple brands from the ‘group’ (pun intended), and ALL the company websites (or those have have them) are all administrated by the same company (and person in most cases), BRK .
So my question is… why exactly do you need 7 different corporate identities to produce and sell a single line of mattresses if there’s nothing ‘odd’ going on?
That aside, what are your personal opinions on the quality of the mattress (and I know you can only tell so much from pictures). The top layer obviously had a few blue gel beads throughout it, but it was still white (not blue) viscoelastic foam as a base, and was nowhere near similar (in my opinion) to the mattress toppers or gel foam samples I played with in a store or two, nor do I think it has the compression or comfort levels of the other samples (which could have been lower densities or just well broken-in). There is definitely a ‘memory’ characteristic to it, but considering the bed is excessively firm in both my and my partners opinions (which was my primary reason for going on this current journey before deciding how to handle my displeasure), especially below the top layer, I’m just curious to hear others, more educated opinions on the overall composition of the thing… you know, aside from the noticeably sloped sides as you go from bottom to top and torn surround which is too tight (despite being stretchable fabric) and compresses the corners slightly (this much worse on some customers’ final product).
I mean - I know it’s an “affordable” memory foam mattress, and I figured they would ‘cut corners’ (again… pun intended) somewhere, as the cliche “you get what you pay for” usually applies across the board, but at this point I’m undecided as to what is ‘acceptable’, what constitutes manufacturing defects, and how much of a fight I’m willing to put up for he price I paid.
Thanks for all the help!
Hi dzignr_tastz,
This in and of itself wouldn’t be a concern for me and there are many manufacturers that have multiple brands that are sold through different channels. It’s a fairly normal marketing practice that is designed to attract different target markets.
The only way to assess the quality and potential durability of a mattress relative to any particular person would be by knowing the specific type and quality of all the materials and components inside it (see this article). Without this information there is no way to make any meaningful comments about a mattress or make meaningful comparisons with other mattresses because you can’t “feel” or “see” the quality/durability of the materials. I personally wouldn’t buy a mattress where reliable information that a consumer would need to make an informed choice wasn’t available and I would consider it to be a “high risk” purchase with a much higher chance of buyers remorse.
For me I would treat “unknown quality” and “low quality” in the same way (high risk). IMO … there are too many reliable, knowledgeable, and experienced manufacturers and retailers that are completely transparent about the mattresses they make or sell and that sell good quality/value mattresses relative to their price range for a consumer to spend much time trying to “pull teeth” to find out information that should be easily available.
Phoenix
Hi dzignr_tastz, as far as multiple companies belonging to one another it is very common. From Zinus, parent company to Spa Sensations, Vivon, Night Therapy, BestPriceMattress etc to something people may be more familiar with like Unilever brand who heads up numerous large companies like Suave bath products, Axe brand bath products, Degree, Lipton, Ben & Jerry’s, Klondike… Unilever controls over 1000 huge name brands of everything from tea bags to snack chips, ice cream and health and beauty products. Not only do they target various markets, men vs women vs different age groups, etc, some of their brands also compete and it’s a win/win.
For that matter, Tempurpedic now owns Sealy and Serta/Simmons are owned together. So instead of 4 companies, you really have 2 major corporate ownerships. Also it’s interesting to know (if wikipedia is correct on this), that Serta was founded in 1931 by not one person but 13 mattress manufacturers, became controlled by National Bedding Corporation which in turn was purchased by two private equity groups: Ares Corporate Opportunities Fund and Teachers’ Private Capital (part of the Canadian Teacher’s Pension Plan). As just a normal part of the population where Serta (and other S brands) were a part of bedding brands as a household name, and not being privy to the industry, I would have had no clue Serta was so complicated. I just assumed it was a stand alone company.
Hi brass,
Not that it matters much but Simmons and Serta are now owned by Advent International (see here).
In addition to the TempurSealy International combination (which also owns Stearns & Foster) and Simmons and Serta being under common ownership the largest airbed manufacturer and 5th largest mattress manufacturer Select Comfort (aka Sleep Number) also bought Comfortaire the second largest airbed manufacturer.
There are other examples of multiple brand ownership in the top 15 or 20 mattress manufacturers as well such as Mattress Development Co being a Therapedic licensee and also owning Eastman House and Eclipse (see here) or the Kluft/Aireloom North American partnership with VI Spring.
Phoenix
Yeah… I could see that, given that there actually are “different channels” or “target markets”. In this particular scenario with SleepShop, however, it seems they are trying to simply create the impression of competition where, in reality, there actually is none, and they (directly or indirectly) control and manufacture every different brand sold in their Amazon store.
On that same subject of “marketing”, however… while some companies might be more ‘forthcoming’ with specifics of the materials than others, how does the consumer really know that’s what they’re getting in the end, or if the manufacturer is even being truthful in their specifications (unless it’s simply a big time manufacturer with a good reputation and some sort of regulation)? Someone that purchased this very same mattress said the company quoted the densities as “Gel: 4 lbs, Core: 5.4” (which are only 2 of the 5 layers, so again, and incomplete - and somewhat misleading - answer), but I won’t begin to proclaim to know what different densities of foams feel like. All I know is the one time I emailed them after feeling the initial (and still) firmness of it they replied with “Our 13 inch mattress is the softest feel we currently offer (apparently, across all their models) and is made to have a plush ‘sinking in’ feeling”, yet in my opinion, aside from the top 3 inches of memory foam compressing (which I can feel ‘molding’ to my body), it is extremely firm from there down, with very little give (which might be good for longevity, but not much for comfort). In fact, I had no idea a memory foam product of any sort could be this firm, which I guess was my primary misconception after randomly testing a VERY comfortable gel foam Serta in Big Lots one day while picking up a few things during a 20% off store-wide sale. Had they offered that one in a king-size (but didn’t… queen only, period), I would have bought it on the spot, but that is what gave me the itch and I guess I jumped in too quickly looking for something else in a semi-comparable price range. Lesson learned… 
(My - lengthy, if you hadn’t guessed - Amazon review, under the same name, kind of explains how all this came to be if you have some - more - time to waste - LOL!)
I guess that part of the knowledge equation just comes from actually testing well-known mattresses of different materials in-store (not that I would feel great about wasting someone’s time to ‘edumacate’ me and then turn around and buy from someone else based on comparison)?
Totally understandable. However, since I apparently jumped the gun on this endeavor and didn’t put in the time, in advance, to thoroughly research what I was buying (shame on me), I don’t mind putting in a little after the fact to get to the bottom of what I actually received… and quite frankly, don’t mind ‘pulling a few teeth’ (not mine, mind you) in the process if deemed necessary to get the answers I’m looking for.
Anyway - thanks again, and sorry for taking up so much of your undoubtedly valuable weekend!
Hi dzignr_tastz,
It could be argued that you can’t (even with large manufacturers) and the same would hold true for any consumer purchase where you would need to tear it apart to really know what was inside it. You could also weigh every mattress that you purchased to see if the specs came out close to the weight but in practical terms you would be reliant on the reputation and integrity of the manufacturer. It would be a big risk for a reliable manufacturer to misrepresent foam densities because they can be calculated from the weight and volume of the material and it’s much easier to lose a good reputation than to develop it.
This is one of the reasons that I so often suggest that who you buy from and their knowledge, experience, transparency, and integrity can be one of the most important parts of a successful mattress purchase.
You can’t “feel” or see the quality of a material and the “suitability” or “comfort” of a mattress in terms of PPP is very different from assessing the quality/durability of a mattress because even very low quality materials can feel the same as higher quality materials in a showroom or when the mattress is new … they just don’t last as long. Suitability, durability, and the other parts of each person’s personal value equation are all important parts of the “value” of a mattress purchase (see post #13 here).
I read it when you first mentioned it … and like others that are probably reading it as well I’m still waiting for the “punch line”
No problem at all … you are asking some good questions and I don’t stray far from the forum anyway … on weekends or weekdays.
Phoenix
Oh… I fully understand a single, parent corporation owning and/or manufacturing many different brands of products, some that even compete with each other (P&G would be another well-known one), but there is usually some sort of well-researched marketing reason behind those ventures, like targeting men vs. women (as you stated), or different economic groups. I can also understand one mattress company buying out another (and perhaps, eventually another, and another), well-established one and not just tanking the obviously valuable corporate identity, but I also didn’t see Tempurpedic trying to flood the market with bargain-basement manufactured memory foam mattresses under several different brands all in the same store right out of the gate, either.
Hi dsignr_tastz, the competition may not come from their own store if they’re promoting their own brands, but from others in a similar category also sold on amazon or elsewhere. They’d be competing against dreamfoam’s lineup of memory foam, night therapy, lucid etc. It sounds like whoever answered the question of densities didn’t understand the question or how to answer and gave what info they could, which would be the foam density for the memory foam and the thickness (not the density) of the core foam. This would be from people without proper education on the product or materials. Trying to determine the feel of different polyfoam densities would be hard to do. I’m sure they have a slightly different feel either in compression subtleties or weight - but for polyfoam, density doesn’t correlate to firmness. You could have low density foam (larger air pockets) that felt the same, softer or firmer than another piece of denser foam (more poly material, smaller air pockets).
I think in the end, while we spend 8hrs (give or take) a night on a mattress, it’s only one of many products we encounter day to day. No one wants to be hoodwinked by any manufacturer’s or products claims. But in the end, without being there every step of the way during the production process you (or anyone) just has to trust the company. Even if they go to the trouble to provide spec sheets, shipping labels and other ‘proof’, do we know that the proof actually applies to what we’re dealing with? I wouldn’t stress over it if the mattress is working well for you. Even confirming every small piece of evidence doesn’t guarantee a wonderful night’s sleep. As a matter of fact, from personal experience I think I lost more sleep ‘investigating’ things on my mattress hunt than I did from my wore out mattress
Phoenix, thanks for the info. I don’t know all the ins and outs but like many things in the corporate world - finance and transitions, deals, etc it seems things are constantly changing. It doesn’t surprise me there have been even more shifts in the Simmons/Serta end of things. I think too part of the confusion is just not being that involved in the business. People in general take it for granted that if it’s got a label from XYZ corp, that’s who made it start to finish. I know it doesn’t usually occur to me when confronted with products on a store shelf that I’m probably debating between the same main brand lol.
[quote=“Phoenix” post=40795]Hi dzignr_tastz,
It could be argued that you can’t (even with large manufacturers) and the same would hold true for any consumer purchase where you would need to tear it apart to really know what was inside it. You could also weigh every mattress that you purchased to see if the specs came out close to the weight but in practical terms you would be reliant on the reputation and integrity of the manufacturer. It would be a big risk for a reliable manufacturer to misrepresent foam densities because they can be calculated from the weight and volume of the material and it’s much easier to lose a good reputation than to develop it.
This is one of the reasons that I so often suggest that who you buy from and their knowledge, experience, transparency, and integrity can be one of the most important parts of a successful mattress purchase.[/quote]
Good points. I’d just like to add that it would be a big risk for ANY manufacturer (reliable or not) to misrepresent their product.
So in regards to densities, comfort level, and durability… aren’t higher densities more durable, but also more resilient, making them more firm, or is it possible to have a super soft, easily compressed, 5.4 lb. density, durable foam? It would seem there has to be some compromise somewhere, and while I’ve have done some reading about IFDs and the like, I am by no means an expert on it.
Well that top part was posted quickly in lieu of everything I found last night (before posting here), but I guess the ultimate “punch line” will mostly depend on what the final, combined results of my research are, and what the company has to say come the first of the week. Until then, I’ll stand by the fact that given what I now know, I wouldn’t have done business with them and wouldn’t recommend it to anyone else, either.
No problem at all … you are asking some good questions and I don’t stray far from the forum anyway … on weekends or weekdays.
Phoenix[/quote]Neither do I, obviously.
Hi dzignr_tastz,
With latex density is directly related to firmness (but only if you are comparing the same type and blend of latex).
With polyfoam and memory foam density is the most important factor in the durability of the material (see post #4 here and the posts it links to about the variables that can affect the durability and useful life of a mattress relative to a specific person) but any density of memory foam or polyfoam can be made in a wide range of firmness levels. Density does have more of a connection to the compression modulus of the foam which is also part of perceived firmness (see post #4 here) but it’s not directly related to comfort or firmness. There is also more about some (but not all) of the different foam specifications that can affect the feel or suitability of a mattress design in post #2 here. Resilience is a measure of the percentage rebound when you drop a steel ball on a layer of foam. Memory foam for example has almost no resilience regardless of its density because it’s a slow response material that “absorbs” energy (and turns it into heat) while latex stores energy (like an innerspring) and then bounces back and has a higher resilience than most other types of foam which is why it’s more “springy” or “bouncy”.
Phoenix
