Rukka D3O Air Back Protector The D30 Air 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