With its 360176 castors and patent pending centre hinge the practical revolution folding bed frame with memory foam mattress is easy to transport and folds up 30 narrower than traditional folding beds it features a j tex174 sprung base system which offers ultimate comfort support and durability the supplied full length memory foam mattress combines high density rebound foam with viscoelastic memory foam to provide exceptional support and pressure relieving comfortdimensionsopen w 77