I bought these to go on my memory foam mattress. A reviewer suggested knit sheets would be a better match with memory foam. I decided to give them a try as my woven sheets kept popping off the corners. I am so glad I did! My memory foam mattress feels brand new again! The knitted sheets give with the foam and allow the mattress to support you as it was designed. I will be buying another set of these. Great sheets at a great price.