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Bontrager's Circuit 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 feel, they also help keep your head dry on those hot rides. - Small = 52-56cm - Medium = 56-60cm - Large = 60-64cm
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