A sliding tether system increases side to side movement This head and neck restraint has a 38.1 SFI safety rating Use of high wing shoulders allows for secure seatbelt containment The DuPont Carbon Polymer construction increases durability and decreases weight Kit includes 2 d-rings and the hardware to install it on your helmet The Hybrid Sport neck restraint harness is the next evolution of the Hybrid Pro Rage technology. Constructed from DuPont carbon polymer materials, the Hybrid Sport is in every way superior to previous neck restraint models. The sliding tether system allows for greater side to side movement. The carbon polymer construction makes the Hybrid Sport 20% lighter than previous models, and much more durable than standard polymer models. The high wing shoulders allow for secure seatbelt containment. The Hybrid Sport straps directly to the driver, allowing it to safely and securely hold your neck and helmet in place, while still allowing superior range of motion. SFI 38.1 certified. DuPont Carbon Polymer construction increases durability and decreases weight. Sliding Tether System increases side to side movement. Simpson Racing SFI.DRK D-Ring helmet hardware installation kit for Hybrid/Prorage head and neck restraint system when outfitting a second helmet.