Giro Women's Lure Snow Helmet Available in 2 Rock Loc 5 Sizes: S(52-55.5cm), M(55.5-59cm) In-Mold construction with designs and finishing touches specifically for women 12 Super Cool vents with Thermostat Control plus Stack Ventilation Compatible with all after market TuneUps systems Compliance: ASTM F2040/CE EN1077