Rukka D3O Air Central Back Protector The Rukka D30 Central Back Protector provides patented, CE approved and breathable protection. D30 Air has been developed specifically for Rukka and is a unique material that combines enhanced chemistry with product engineering to produce high performance shock absorption and impact protection. The D30 material contains intelligent molecules that flow freely when moving but lock together to absorb impact energy upon impact. Features High performance shock absorption Maximum flexibility Extremely comfortable Tested according to CE-standards Excellent airflow through protector Fits all Rukka and Olympia Jackets (men's and women's) sold by RevZilla 2014 and later Rukka Jackets (AiRider, Airman Armaxion) include a slip-in pouch inside of the back protector pocket holding the back protector firmly in place. In previous models (such as Airway and Armas) some movement of the back protector within the pocket is possible.