Klim Airbag Vest Compatible D3O L2 Back Protector The D3O L2 Back Protector is designed for compatibility with Klim Airbag Vests, offering enhanced protection for riders. This back protector utilizes advanced D3O technology, known for its exceptional impact absorption properties, ensuring maximum safety without compromising on comfort. It seamlessly integrates with Klim Airbag Vests to provide an additional layer of defense, making it an essential upgrade for riders seeking improved protection. Features: Suitable as an upgrade for Klim Ai-1 vests, or as a direct replacement for the Ai-1 Rally CE Level-2 Sizing: SM Vest: SM MD Vest: MD Lg-3Xl Vest: LG