Zero Deflection Spring System for our firmest beds ever. Sealy Smart Fibres provide a Cool, Fresh, Dry and Hypoallergenic sleeping environment. Eco-friendly Tencel fibres help keep you cool and dry. Sealy Edge Guard provides edge-to-edge support for greater durability and comfort. Layer of memory foam to aid spinal alignment. Endorsed by Allergy UK for the reduction of house dust mites. Correctly supports and aligns the spine in its natural shape, helping to reduce aches and pains.