The topper features 2.5 lb. density temperature control memory foam that adjusts to your body temperature to help alleviate pressure points and relax muscles for a more soothing night’s sleep. Memory foam is resistant to dust mites and is naturally antimicrobial. The topper also comes with a zippered removable cover that features 3M Scotchgard™ moisture-wicking management. The cover has a non-skid backing which locks the topper in place on your mattress. The topper comes in full mattress sizes to give your bed end-to-end coverage. Our packaging technology allows the mattress topper to be efficiently compressed into one box that’s easily shipped to your door. Simply unbox, unroll, and this mattress topper does the rest, expanding to its original shape within 72 hours. The topper comes in full mattress sizes to give your bed end to end coverage. Twin: 39x75 Twin XL: 39x80 Full: 54x75 Queen: 60x80 King: 78x80 Cal King: 72x84 2", 3" or 4" thick