hi psliebr,
The Cloud has 1.2" of ES (4 lb) and 1.6" of Tempur (5.3 lb) for a total of 2.8"
The Cloud Supreme has 2" of ES and 2" of Tempur for a total of 4"
Part way down the page on each description is a “details” tab and if you click on it you will see the layering of each mattress.
There are two or three “competing” factors at work here. A thicker layer that you sink into more will generally be warmer because there is more “insulation” around your body. On the other hand … with the Cloud Supreme the upper 4 lb layer is thicker and more breathable so it would be a little cooler. Which is cooler would probably depend on the body type of the person on it. With the Cloud there is less memory foam to sink into but less of it is the 4 lb more breathable memory foam. With the Supreme there’s more memory foam to sink into but more of it would be the more breathable 4 lb foam. In addition to this … lower density foam is also less conforming so the insulating layer of foam doesn’t “fit” quite as closely around the body as higher density foam (once it softens up).
So the Cloud would have the cooling advantage of having less foam to sink into while the Supreme would have the cooling advantage of having more breathable less conforming foam next to the person. Which was cooler would depend on the person and whether cooling effects of the 4 lb foam offset the depth of the “cradle”. Heavier people that sank more deeply into both the 4 and 5 lb layers of the Supreme may find it a little warmer for example.
There’s a discussion in post #6 here about cooling down memory foam.
All the Tempur foams are warmer than many other types of foam used by competing manufacturers who have put a lot of effort into introducing cooler sleeping memory foam and this is one of the driving factors behind the current popularity of the many gel memory foams that are being introduced.
I certainly understand this but just to clarify my previous comment … Tempurpedic hasn’t been by itself in the “highest quality group” for quite some time so although it is certainly high quality foam … it is not alone in this group by a long shot. Their marketing has created the perception that it is the highest quality memory foam but there are many competing foams of equal density/quality that are also cooler, more breathable, and less motion restricting than Tempur foam in the same density range. They are also significantly less expensive. There are also lots of low quality/density memory foams on the market who like to misleadingly compare themselves to Tempurpedic but if you know the density of a foam and it is American made then it is likely very comparable to Tempurpedic in the same density although the characteristics of the foam may be different (response rate, temperature sensitivity, breathability etc).
This is an area that Tempurpedic has lagged behind and ironically enough … their new Simplicity line uses some of the lowest density/quality memory foam available anywhere (2.5 lbs). The cooler gel memory foams in particular are eating into Tempurpedics market share in a big way and other companies like Serta (iComfort) have out marketed them and they are now paying the price because they didn’t seem to see the inevitable coming. There’s an interesting article here about this.
Phoenix