Night Therapy 8" Tight Top Spring Mattress & Bed Frame Set - Split King(Twin XL) Cover is a polyester jacquard with fire barrier, Durable steel, 32 gauge coils Smart Base steel foundation requires no tools for assembly, with a maximum weight capacity of 1200 lbs Machine washable dust ruffle 36" large under bed storage unit features zipper closure and is made of durable nylon Headboard and footboard brackets are sold separately