Posture 3000 mattress is part of our firmer orthopaedic backcare range. perfect for hotels and B&Bs. Easily separates into two single mattresses. Crib 5 compliant. 3000 iDentity pocket springs. Hypoallergenic fillings. King Size (5'0" x 6'6"), Super King Size (6'0" x 6'6").