I did some simple math and assuming the top are 3" of 4lb and 2" of 5lb, and also assuming standard queen size 60"x80" and total weight of 105lbs, then the 8" SHOULD be a little over 2lbs.
The package weight from dreamfoam shows 110lbs and amazons website shows 107lbs, so i assumed 105lbs without any packaging.
My calculations are a little different from yours although the best source of any āofficialā information would be Dreamfoam.
Top layer is 3" x 60" x 80" = 14400 cu in / 1728 = 8.33 cu ft x 4 lb density = 33.3 lbs
2nd layer is 2" x 60" x 80" = 9600 cu in / 1728 = 5.56 cu ft x 5 lb density = 27.8 lbs
bottom layer is 8" x 60" x 80" = 38400 cu in / 1728 = 22.22 cu ft x 1.5 lb density = 33.3 lbs
Total weight = 33.3 + 27.8 + 33.3 = 94.4 lbs plus the weight of the cover and any packaging.
Densities are never exact and shipping weights often arenāt exact either but itās certainly āin the ballparkā.
chuck from dreamfoam confirmed that itās 1.5lb density for the 8" layer, and the dimensions are 60" x 79" for a queen size. shipping weight may not be entirely accurate, but i would assume theyāre more accurate than not due to the fact they charge shipping based on weight. and ups and fedex both show the 13" gel within 3lbs of each other (107lb vs 110lb). packaging alone is probably between 10-15lbs. mattress cover maybe adds another couple lbs.
anyway, i donāt have plans to weigh my 13" gel mattress any time soon, but this was a nice thought experiment to work out how much it should weigh.
Just following up - we have been sleeping on this mattress for about a month, and I have no complaints, it is holding up quite well so far, no indentations and it still has a brand-new feel. Iāve never slept better
Now that you are past the break in and adjustment period that goes with any new mattress purchase ⦠with the quality of the materials in your mattress you can reasonably expect that you will be sleeping well for many years to come