The Boa® wheel mechanism is a component of a closure system for boots. It is a patented closure system that uses a wheel to adjust and loosen a steel cable that wraps around the foot. The wheel is rotated in one direction to tighten the cable and in the other direction to loosen it, allowing for precise and easy-to-use adjustments. The Boa® system is very popular in the world of action sports, such as cycling, skiing, and snowboarding, as it allows for quick and precise adjustments without having to un-buckle and re-buckle laces.Referencia: HTR4001