Bell's Lumen boasts their tough and stylish Fusion In-Mold Microshell and their GPS fit system and Cam-lock straps for an easy to adjust custom fit. Plus, for ride-all-day comfort, there are 22 vents with Bell's ventilation channels to keep the air flowing through the helmet.
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Love the helmet and the price is great, but was worried about the thin plastic used for the head GPS strap adjustment mech... but now that I am using it I feel better. Very comfortable...