Futon mattresses have a tendency to slip and move around on a frame. A Non-Slip Gripper Pad eliminates this problem. Non-Slip Gripper Pad is placed underneath the futon mattress, on the seat deck and keeps the futon mattress from moving, slipping and sagging. The gripper is an essential futon accessory made of non-slip foam. This modern-miracle anchors your mattress into place and keeps it there! (The same kind of material is also commonly used to keep floor rugs in place.) One size Fits All.