Giro Seam Snow Helmet Available in 4 In Form Sizes: S(52-55.5cm), M(55.5-59cm), L (59-62.5cm), XL (62.5-65cm/limited colors) In-Mold construction, X-Static Anti-Bacterial Padding 12 Super Cool vents with Thermostat control plus Stack Vent Compatible with all after market TuneUps systems Compliance: ASTM F2040/CE EN1077