This item cannot be returned once opened, so buyer beware.My first impression of this mattress was good, but after 7 months of use, I am very disappointed and in search of another mattress. Before I go further, let me say that we are not large people... I am 5'9" / 155lbs and she is 5'2" / 115lbs... not exactly a crushing load.This memory foam is very much inferior to the brand name equivalent, so don't purchase this thinking you're getting similar quality. My sister has had the real-deal for years now and the density and comfort is hugely different and it has perfectly retained its shape. This mattress does *not* retain it's shape over time. There are two permanent indentations where our lower backs / butts rest that do not return to their original shape by the next evening. Your body heat softens the foam and allows you to sink in a bit, but with two people, the foam between you softens and you both end up sinking toward the center of the bed. Using a pillow is counter-productive with this mattress as well. Your weight distribution shifts to your butt and prevents your shoulders and head from warming up the surface and sinking it at all. So your butt sinks in even further, which doesn't feel great over a long night. It is actually much more comfortable to sleep without the pillow on this mattress. This allows your head and shoulders to sink in a bit and spreads your weight more evenly across your entire body.Would not recommend this purchase.