Zinus Weekender Elite Folding Guest Bed with Bonus Storage Bag 4 Inch mattress features premium cover 1 inch top layer of fiber padding plus 3 inches of Pressure Relieving Comfort Foam for support Deluxe steel frame with casters for easy transport Casters are uniquely positioned on the frame, so when it is open the legs do not move around on the floor Worry Free 1 year limited warranty