Get ready to hit the park and trails with the Giro(R) Adult Bevel Snow Helmet. This helmet features In Form technology for easy adjustments to most goggles and head shapes for an awesome fit. The Super Cool vents help pull cool, fresh air into the helmet and push hot, stale air out to keep you comfy on the slopes. A hardshell construction is durable enough for the many seasons ahead! DESIGN & TECHNOLOGY: Adult fit Designed with rider input Super Fit engineered for a snug, secure fit while riding In Form sizing allows for a dial-in, custom fit Glove-friendly size dial 8 Super Cool vents push hot air out and vent cool air in Innovative Stack Vent system aligns with the center vent to keep goggles clear and free of fog Ventilation systems allow goggles an anti-fog wear Compliance: ASTM F2040 / CE EN1077 Hard, durable exterior shell EPS foam liner for a comfort fit SIZING: We recommend you try helmets on before buying. Make sure the helmet fits with a little room when the fit system is loose, and sits low enough to protect your child's forehead without hindering vision. Once you've got the right size, you can adjust the fit. Small: 20.5"-21.8"/52-55.5 cm Medium: 21.8"-23.25"/55.5-59 cm Large: 23.25"-24.7"/59-62.5 cm