Bontrager's Circuit WSD is a lightweight road helmet that features 21 vents for maximum airflow. It features their one-hand-adjustable Zip-Tite fit system, plus it has an in-molded strap retention system with LockDown strap adjusters for a superb fit and top-notch safety. The premium fit pads not only give you a custom-fit feel, they also help keep your head dry on those hot rides.
- Small = 52-56cm
- Medium = 56-60cm