Provide instant comfort for your guests with the Rollaway Guest Bed * 4" Topper has two different layers of 1" thick fiber padding + 3" super soft foam * The cover is a silky soft fabric made with a blend of bamboo rayon fiber * The 4" mattress provides generous loft for great comfort * Casters are uniquely positioned on the frame, so when it is open the legs do not move around on the floor