Bedstars exclusive orthopaedic range a range of beds offering traditional firm orthopaedic mattresses with added comfort and style complete with high quality damask and stitchbond fabrics and totally hypoallergenic polyester fillings wrapped in a heavy steel frame ensuring stability for these amazing mattresses 13 gauge firm open coil spring unit an open coil spring system is fundamentally one spring which runs continuously throughout the mattress 9 gauge frame firm frame support extra