Giro Phase Bicycle Helmet. The Giro Phase Mountain Bicycle Helmet is a top performer for riders looking for a low profile Bicycle Helmet at a great price. It's lightweight, cool, and durable enough to handle even the most daunting climbs and rocky ribbons of singletrack. And dialing in the perfect fit is an easy endeavor courtesy of the Roc Loc 5 retention system and the comfort of Super Fit sizing.
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