A must for anyone who drives an open cockpit car, RaceQuip SFI 3.3 Arm Restraints are manufactured using high grade steel hardware with premium polypropylene webbing utilizing hook and loop fastening. RaceQuip's SFI rated arm restraint design utilizes 2" webbing for the cuffs and 1" webbing for the tethers that are attached to the cuffs. The cuffs are adjustable from 10" to 15" and the tethers adjust in length out to 20" so they work for most adults. The steel ring at the end of the tether is designed to slide over your shoulder harness end link so they release with your belts.