What the manufacturer Says:-
The Oxygen Speed X annexe uses the same Oxygen Airframe Technology as the awnings and zips on to the left hand side of the Oxygen Speed 1, 2 and 3 (left hand side when you are looking at the awning from the outside). The inflatable annexe provides superb additional sleeping space for two people, or creates extra storage space. It comes equipped with a double inner tent, which comfortably fits a double air bed.
The annexe incorporates the original Dynamic Speed Valve in one Airframe tube, which makes it exceptionally quick and easy to erect. The 150 Denier Double Rip-stop Acrylix fabric is incredibly strong yet lightweight; providing the optimum lightweight to strength ratio. The double rip-stop aspect helps reduce rips and tears from occuring but if they do occur it will prevent it from running and making the tear worse. Protected with Sun Pro UV, the material will not fade or go brittle, it will maintain its quality for up to three times longer than any unprotected material.