Platform beds provide a better value than a metal bed frame, box foundation and basic headboard. Only Platform beds can use Under Bed Chests or a Trundle. Platform beds are mattress ready with slats included all platform beds larger than twin have a center support beam with two legs. Space under the side rail is 11.3” providing generous drawer space and allowing up to a 9” mattress on the trundle bed. Storage and trundle sold separately. 400 Pound weight rating Mattress ready No metal bed frame No box foundation Bonus Under Bed Options. Dimensions: (HxWxD) Pecan: 42.25”x58”x80” Grey, White: 43.25”x57.5”x78” Sandstone: 45.25″x58″x80″ Birch, Aspen: 43.25”x57.5”x80” Espresso: 40.5”x57”x77” Ebony: 40.5″x58″x78″