Twin Size Folding Bed with Foam Mattress and Lockable Wheels4 inch high density foam mattress scientifically fits body curves and offers ample support for high quality sleeping Smooth wheels for effortless moving including lockable wheels and directional wheels Strong metal tubes rustproof to maintain a look like new 15 solid birch wood slats enhance overall load capacity up to 490 lbs Anti falling bars prevent the mattress from dropping Hook and loop fasteners further keep the mattress in place Anti slip foot