My husband and I have been sleeping on this mattress topper for three weeks now. It has given life to a mattress that was quickly becoming one that needed to be replaced. This topper covers the entire mattress(king). We're very pleased! We rest better, sleep more soundly and wake up with fewer aches and soreness than before we made the purchase. We chose to go with the peaks side up to encourage air flow and we haven't noticed sleeping warmer as some toppers do. The only thing I found misleading is the hand print shown in the advertisement photo. This doesn't retain a shape and then slowly spring back up like true memory foam. But, that wasn't important to me with the comfort level we feel this topper has. If you want the memory foam effect, keep looking. We, though, are very satisfied.