Giro Encore 2 Snow Helmet (White Towers, Medium) Available in 3 Fit Kit Sizes: S(52-55.5cm), M(55.5-59cm), L (59-62.5cm) Hard Shell construction 13 Super Cool vents with mesh covers Compatible with all after market TuneUps systems except wireless. Compliance: ASTM F2040/CE EN1077/CPSC