Giro Revolver Snow Helmet (Teal, Medium) Available in 3 Fit Kit Sizes: S(52-55.5cm), M(55.5-59cm), L (59-62.5cm) Hard Shell construction with Interior Subliner and Interior Goggle Channel 6 Super Cool vents with mesh covers and Stack Vent Compatible with all after market TuneUps systems except wireless. Compliance: CE EN1077