Ortho Memory Supreme. With the unique Flexiform spring system, containing an impressive 650 springs, this medium tension mattress provides plenty of support and comfort for your body. Deluxe layers of hypo-allergenic fillings make this mattress perfect for those suffering with asthma or allergies. Finished with a luxury quilted top this model also has the reassurance of a full 5 year guarantee. And buy this Ortho Memory Supreme Was £169.00 Now £159.00.