This Helmet Strap works by sliding your arm through the loop in the strap and pulling the strap up to your shoulder. The spring loaded quick release hook attaches to the ''D-ring'' on the side of your helmet. The easy pull strap allows for quick and simple restraint adjustment anytime, in or outside the car. The strap is designed to reduce head and neck fatigue by limiting the ''G-load'' exerted to your head and helmet in the corners during long races. Includes durable steel hardware and helmet ''D-ring''.