We bought this to cover our 2 year old memory foam mattress. I read recently that the chemicals that are put off from memory foam mattresses are very toxic. But since this is newer we didn't want to reinvest in a new mattress just yet. Not only does this serve its purpose but it's so unbelievably comfortable! It's warm and keeps you from getting sweaty like our mattress did. We love this and will be buying the wool comforter to replace our current down comforter.