Product DescriptionThe Giro Athlon helmet was developed for competition but works great for XC racing trail riding and endurance racing. 23 wind tunnel vents plus smooth style and compact shape. Low profile P.O.V. visor and Roc Loc 5 fit system are some of the features that just might help put you on top. 425g medium. Small 20 - 21.7551cm - 55cmMedium 21.75 - 23.2555cm - 59cmLarge 23.25 - 24.7559cm - 63cm
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