Giro Phase Mountain Bicycle Helmet. First and foremost, a mountain bike Bicycle Helmet should be comfortable and durable. The Giro Phase Mountain Bicycle Helmet is true to the core lightweight, cool, and durable enough to handle even the most daunting climbs and rocky ribbons of singletrack. With the easy fit and adjustability of the Roc Loc 5 retention system and the comfort of Super Fit sizing, it's a top performer for riders looking for a low profile Bicycle Helmet at a great price.
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