Always had memory foam silent night mattresses in the past slightly cheaper,they last 3 -4 years,thought we would try a different brand,when it came was impressed how thick it was,its hard to compare if you sleep cooler,I can not imagine the design drags cool air in on warm days as the mattress as a cover plus your duvet cover,I'm hoping it lasts a bit long than the silent night mattresses,but I think after a while all memory foam will loose its shape.