MECHANISM: easy convertible pouf to bed mechanism. The opening system you need to lift the seat and it converts into a bed with a simple movement of the mechanism. The sleeping area has a 12cm thick mattress and is made of an electrically welded frame. UPHOLSTERY: differentiated density polyurethane foam, produced and assembled according with the CEE standards. LINING: fabric or synthetic leather: completely removable lining. Leather: no available. FEET: integrated in the mechanism.