Bell's Lumen boasts Bell's Fusion In-Mold Microshell for top strength and durability, their GPS fit system and Cam-lock strap levers for a custom fit and feel, and 22 vents with cooling channels so you stay dry and comfortable on every ride.
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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...