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. Small Single (2'6), Single (3'0), Small Double (4'0), Double (4'6), King Size (5'0), Super King Size (6'0).