Support: 13.5 gauge open coil bonnell spring for added support. Memory foam: Adapts to your natural body shape. Sizes: Available in 2ft 6, 3ft, 4ft, 4ft 6, 5ft and 6ft. Hygienic: Hypo-allergenic & dust mite resistant. Mattress: Get a new memory foam sprung mattress. Easy to assemble: Rolled and vacuum packed.