Bell K 1 Pro Helmets are multi-use, full-feature helmets with superior ventilation, aero styling and Bell's aggressive chin bar design and front chin gurney (or Duckbill). Bell K 1 Pro Helmets are a great helmet for open wheel racers, closed car racers and kart racers who demand superior features including light weight, excellent fit and multiple ventilation options. The Bell K 1 Pro Helmets can be used in an open wheel configuration with air intake (which is included) and with a closed car configuration with top forced air insert (sold separately).