First and foremost a mountain bike helmet should be comfortable and durable the phase is true to the corelight cool and durable enough to handle even the most daunting climbs and rock strewn ribbons of singletrack with the easy fit and adjustability of roc loc 5 and the comfort of super fit sizing its a top performer for riders looking for a low profile helmet at a great price featuressnap fit 2 visorconstructionin mold polycarbonate shell with eps linerfit systemroc loc 5ventilation