Ortho Memory Supreme. With a unique spring system, containing an impressive spring count, 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 Now £179.00.