The Mega Mat has a super soft fabric which is a slip resistant brushed tricot polyester. Backed by a laminated Airblock PU film that guarantees it is leak proof even if humidity accumulates up during inflation. The Mega Mat is filled with ultra-lightweight open celled PU foam with horizontal air channels through it to reduce weight without sacrificing thickness. Inflation & deflation are handled by separate flat valves for ease of use. Simply open up the inflation valve & the Mega Mat will self inflate, if you need to give it a helping hand a mini-pump is included & pressure can be fine tuned by tapping the one-way flap on the inflation valve. The welded 3D construction means that the Mega Mat remains comfortable right up to the edge, so no matter how much you roll around you always be cosseted by warmth & luxury. The mega mat range is perfectly suited to making up a luxurious double bed, so a simple coupler kit is included to strap two of these beauties together. Ultra comfortable Ultra thick Ultra warm Soft & slip resistant outer fabric Foam block core Self inflating Mini pump included Coupler strap included Durable 5 year warranty