Sleep Master 8-Inch Memory Foam Mattress Set with Bi-Fold Boxspring, Twin Includes twin 8" memory foam mattress and twin-size 9" Bi-Fold box spring 2" layer of foam ventilated at key pressure points on the body - head & shoulders, hips, feet Bi-fold box spring simply unfolds; no tools required; steel frame provides maximum edge support Limited 5 year warranty for the mattress; Limited 1-year warranty for Bi-Fold box spring