The Visco Therapy Bonnell Reflex Super King Size Mattress 5cm Reflex foam provides a firmness that gives you extra body support that meets your needs. The Bonnell Reflex mattress also has a boundary made from reflex foam around the Bonnel springs to prevent you from rolling off the mattress while you sleep. Traditional coil springs are used to give you the extra comfort. Comes complete with a beautiful double jersey cover which is zip off & dry cleanable. Hypo-allergenic fillings & sanitised fabric make it ideal for people with allergies. Anti dustmite features. non-slip fabric ideal for slatted base beds. Made to british standards/regulations