Thats because its the lightest most-ventilated & technically advanced carbon fibre full-face mountain bike helmet out there. To help make sure of it the 3d sculpted cheekpads & 4th dimension cooling system keeps things airy in the heat while the carbon matrix shell keeps it light enough for all-day comfort. The new angi crash sensor gives you & your loved ones peace of mind like never before, when combined with the ios or android app the sensor will detect a crash & send a text message to specified contacts in your phone. It also syncs with the app & strava to provide gps-based activity tracking.