Therm-a-Rest NeoAir Jembe Seat Kit

CampSaver.com says:
Therm A Rest's Deluxe Seat Kit uses the inherent stability of your NeoAir(TM) mattress to create a comfortable and unique chair. The Deluxe features a plush cover and an extra durable fabric base that protects your mattress in rugged terrain. Closed-cell foam padding adds an extra level of comfort, making this seat kit worthy of any campsite.