I bought this to replace a previous Tempurpedic that was 13 years old, and had lost a lot of its resilience. This one performs as well as the older one except in one regard. The cover on this one is much more slippery than my prior one, so much so that it is impossible to keep the bottom sheet tucked under it. With the slightest tension, it slides out. I have resorted to those elastic suspender things to try to hold the edges of the sheet under, but they aren't terribly effective either. Seems to me that things would be much better if the underside of the mattress cover was made out of a material that had a much higher level of friction.