Arm restraints are simple devices. Depending upon the manufacturer, their adjustability can be either via D-rings/straps or hook-and-loop fasteners. They are worn on the arms and connect to your harness belt to prevent your arms from exiting the cockpit in the advent of a rollover. The NHRA and SCCA both require arm restraints on open-cockpit vehicles. Racequip recommends a contrasting color to your driving suit or jacket so officials can easily see that the restraints are in place. We picked a set of red ones to contrast with our black racing jacket and pants.