A simple solution to refresh or your sofa bed mattress. The full-size Sleep Master 1.5″ memory foam topper for sofa beds has bands attached at each corner to hold the topper firmly in place. Once your guests are gone you can unzip the cover and throw it the wash. Our patented compression technology allows for convenient FedEx/UPS delivery. Once you receive your memory foam mattress topper please allow 48 hours for it to fully expand.