Best Price Mattress 4" Small Trifold Mattress Topper - CertiPUR-US Memory Foam Mattress Topper with Cover, Small size Great for camping, overnight guest, car trips and sleepovers 1.5" Memory foam top layer + 2.5" high-density base foam layer for added comfort and support 100% poly-Jacquard zippered cover with slip-proof bottom (machine washable cool/gentle) Dimensions: open 75'' X 33''X 4'' folded 25'' X 33'' X 12''