Hi narayan,
Thanks for the update!
The Savvy Rest does use good quality and durable materials. The Beautyrest doesn’t use any latex, but is instead a combination of pocketed springs, polyfoam and memory foam, so if you’re looking to stay more “natural”, it definitely would be an item you’d want to avoid, combined with the lower density of polyfoam and memory foam it uses:
.75" Gel Touch polyfoam 1.5LB, 1" Luxury Firm Comfort polyfoam 1.65LB, 1" Energy polyfoam 1.5LB, .5" Micro Diamond memory foam 2.8LB, pocketed coil spring unit,1.5" density foam 1.2LB.
Savvy Rest uses 100% NR Dunlop from Cocolatex and they rate their firm at 40+ for the ILD. The ratings they provide are approximate and not official. If you stay in the low/mid 40s ILD for the Dunlop you should be “in the ballpark”. The suggestions Spindle gave you are good ones, and you may also wish to consider some of the other site members listed in post #21 here who are all very experienced and knowledgeable, and some of whom have a wide range of Dunlop latex options available, and all of them compete well with the best in the industry in terms of their quality, value, service, and transparency.
ILD is only one of several variables or “specs” that will determine how soft or firm an individual layer or a mattress “as a whole” will feel to different people (see post #4 here). While the ILD of different materials or different types and blends of latex also aren’t always directly comparable to each other (see post #6 here), if you compare Dunlop, specifically 100% NR Dunlop, in similar ILDs to what you tested locally and find products using similar coverings (cotton quilted to wool), you should be able to stay within a similar range of comfort.
There is more information in post #9 here about the different ways that one mattress can “match” or “approximate” another one. Every layer and component in a mattress (including the cover and any quilting materials) will affect the feel and performance of every other layer and component and the mattress “as a whole” so unless you are able to find another mattress that uses exactly the same type of materials, components, cover and quilting, layer thicknesses, layer firmnesses, and overall design (which would be fairly unlikely) then there really isn’t a reliable way to match one mattress to another one in terms of “comfort”, firmness, and PPP (Posture and alignment, Pressure relief, and your Personal preferences) based on the specifications of the mattresses (even assuming that you can find out all the specifications you would need for both mattresses you are comparing in the first place).
The major brands such as Sealy/Stearns & Foster, Simmons, and Serta all tend to use lower quality and less durable materials in their mattresses than most of their smaller competitors that will tend to soften or break down prematurely relative to the price you pay which is why I would generally suggest avoiding all of them completely (along with the major retailers that focus on them as well) regardless of how they may feel in a showroom along with any mattress where you aren’t able to find out the type and quality/durability of the materials inside it (see the guidelines here along with post #3 here and post #12 here and post #404 here).
I hope that information was helpful to you. I’ll do my best to answer other questions for you as you go through your search.
Phoenix