Hey Bobby,
Thanks for your reply and updates 
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[quote]So at this point I think I’m leaning towards latex due to it’s better temperature performance and superior durability. I believe I’m also leaning towards a latex hybrid as it would seem the innersprings would sleep cooler as well as make the bed slightly more lively then foam core.
At this point I’m still doing research but think I have it tentatively narrowed to these options (open to other suggestions as well):
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Excellent! Now that you have identified your preference for a latex hybrid mattress, the real work can begin. You have nailed the comparison of an all-latex vs. a latex hybrid mattress well, Bobby. Both mattresses would sleep cool and rank on the high end of durability; however, a latex hybrid’s pocket coil array does allow for a nice airflow through the support core. And pairing the coils with latex comfort layers, especially Talalay latex, does provide a nice, responsive feel. You have a number of choices, let’s look at how they fare.
[quote]• Luma Sleep Natural Latex Hybrid[/quote]
Luma’s Natural Latex Hybrid mattress features an exchangeable mattress pillow top, available in Dunlop latex and 3 firmnesses, over a 2" natural latex transition layer and an 8" QEE Bolsa coil unit. There is also an optional Talalay latex upgrade, as well as a 3" latex (Natural or Talalay) upgrade. There is a free 365 day Comfort Exchange option, as well as a free 100 night sleep trial return policy.
[quote]• Nest Latex Hybrid[/quote]
Nest Bedding’s Natural Hybrid Latex mattress, available in 3 firmnesses and features an exchangeable 3" Natural/ Dunlop latex comfort layer, a 1" transitional comfort foam layer, over a 6" pocket coil unit. Nest offers a 100 night sleep trial return policy and a comfort layer exchange option.
[quote] • Avocado Latex Hybrid (without pillow top)[/quote]
Avocado Green Mattress’s Latex Hybrid/ standard model features 3" of Natural/ Dunlop latex over an 8" five-zoned pocket coil unit. It is available in one firmness: Medium-firm. Given its coil gauges, it seems overall a firmer mattress than the Luma Natural Latex Hybrid. Avocado offers a one-year sleep trial return policy.
[quote] • Winkbeds Eco Cloud Latex Hybrid[/quote]
Winkbeds’ EcoCloud hybrid mattress offers a 2 textured Talalay latex comfort layers over 8" five-zoned pocket coils, available in one firmness: medium. Their site doesn’t offer detailed component specs, so I’m not sure how the pocket coil zoning works, but judging from the product cutaway image, the Talalay comfort layer/ description appears to be zoned as well. Winkbeds provides a 120 night sleep trial for its mattress.
Saatva’s Latex Hybrid model features a 3" layer of 5-zoned Natural/ Dunlop latex over a single-zoned pocket coil unit, available in one firmness: medium-firm. No detailed component specs are available for a durability assessment. Saatva does provide a single exchange during their 180 night sleep trial return period.
Any of these four models could be a good latex hybrid choice for you both; however, neither Winkbeds or Saatva discuss product specs in detail for further insights of how long they may serve you well. All of your candidates do have appropriate product certifications, ensuring that they have been tested for safe use.
I’ve been curious about Bedgear’s lineup, as I’ve been seeing more of their social media promos lately. To your point, their site doesn’t disclose any of their proprietary foams or other ingredients’ specs, so there isn’t a comparable way to understand what’s inside or how durable the materials are. They do offer a 30 day return period, but the customer is responsible for that cost. As you’re not actively considering this model, this detail is a moot point, but Bedgear does have an email contact address and phone number. That would be a way to ask more details about their products, for other consumers who may have questions about the specs.
[quote]At this point my main considerations in selection criteria are:
• Latex hybrid mattress (up for discussion whether comfort layer has to be dunlop or talalay or whether we have no preference after trying out some options)
• Great support for sleeping on my back and alleviating back pain/soreness while still allowing us to sleep on our side
• Sleep cooler then memory foam
• Good / free return policy with meaningful free night trial (most have 100 or 120 days)
• While not a requirement having some modular design is enticing to either replace a single layer to adjust firmness or replace later on if it wears out instead of buying a whole new mattress 7 yrs down the road[/quote]
These are all good “wish list” items for selecting a mattress, Bobby. Trusted membersLuma Sleep, Nest Bedding, and Flobeds all have exchangeable/ replaceable comfort layers, and all use latex in one form or other. Any of them could be a potentially good fit for you both, in terms of support and durability, as well as the “sleeping cooler” factor. They also provide generous sleep trial and return policies, giving you the confidence to make a purchase sight unseen. If you haven’t already done so, you may consider taking advantage of the manufacturer’s Live Chat or Email consultation options for getting help with your specific comfort and support questions.
[quote]Some beds have zoning either in the coils or by using different firmness foams in different areas (primarily flobeds does the foam zoning while winkbeds and avocado use the zoned coil setup). At first glance it would seem that getting a “zoned” mattress would be beneficial but after reading more on it is it accurate to say it isn’t necessarily better? There is a place by me called “Sleep Sherpa” that has a showroom where you can try out many of the online mattresses first so we may do that to see if we can get a feel for whether we want dunlop or talalay or if we don’t have a preference, as well as see what firmness we likely want and if we can agree on a single firmness or whether we require a split firmness mattress. It’s nice having the free trials and returns, but ideally I don’t want to buy something unless I’ve tried it out first and know it’s going to work well rather then having to deal with exhanges/returns later. Of course if we can’t find anything we try out locally that works best for us and there is an enticing online option with free returns then we could go that route as well.
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Using either zoned latex comfort layers or zoned pocket coil systems is a matter of personal preference, and I would definitely advise that you try something similar before purchase in a showroom if it all possible. There are reports that zoned mattresses can be a bit too firm for some, but for others, mattress zoning is the perfect support solution. The Sleep Sherpa’s showroom would be a good place for you to get latex hybrid experience. Don’t forget: you may also ask TMU’s trusted members in the latex hybrid category questions about their models as well 
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[quote]Didn’t see an option to edit my previous post but another criteria for me is durability and also to minimize disturbances when partner moves around at night. For the stability though that’s secondary. If we find a mattress that’s perfect for everything else but there’s still some motion transfer then I’m content to live with that.
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You should find with these latex hybrid models, especially in a king size, that motion separation should be well-provided by the pocket coil support units. They are designed to respond to the body’s profile individually as it moves over the mattress’s surface, minimizing motion transfer from one partner to another.
Hope this help some, and good luck with your research.
Sensei