The Athlon was developed with a single purpose in mind XC racing. This helmet combines 23 generous Wind Tunnel vents plus smooth style, a compact shape, minimal weight, and an updated, low profile P.O.V. visor.The ideal helmet for high performance XC riding has to be light and cool without sacrificing features. The Athlon offers optimized coverage without excess weight, and huge Wind Tunnel vents with internal channeling that deliver serious cooling power. The Roc Loc 5 system enhances stability and comfort on the trail, and the adjustable and removable P.O.V. visor shields your eyes from sun and branches. It's everything you need on the trail, and nothing more.Garmin Vector Pedal based Power Meter Features: Updated low profile P.O.V. adjustable visor w 15deg vertical adjustment In mold EPS liner, polycarbonate shell Roc Loc 5 23 Wind Tunnel vents, internal channeling.