DO NOT BUY THIS MATTRESS! Overstock service and support was awesome! They are not responsible for the quality of the product I received. It's the first mattress I'ver ever seen that can not be flipped. There is a bottom and a top. It's very cheap and flimsy and uncomfortable. I'm going to ask Overstock if there's anything I can do about it. Hoping for some sort of a refund. If I had it to do over again, I'd never buy a mattress without trying it out first.