Keep your noggin protected on the slopes with the Smith Optics(R) Adult Mission Snow Helmet! The Mission boasts plenty of ventilation to keep you cool, dry and comfortable, while minimizing fog from your goggles. Aerocore(TM) construction regulates your helmet's temperature, allowing you to ride safely without your goggles fogging up! DESIGN & TECHNOLOGY: Perfect for skiing, snowboarding and other snow sports activities Adult fit Aerocore(TM) construction with Koroyd(R) technology for improved temperature regulation AirEvac 2 technology pushes hot air out and cool, dry air through while keeping goggles clear of fog Regulator adjustable climate control with 14 vents for maximum airflow and climate control Custom fit with the adjustable dial fit system (DFS2) Includes Snapfit SL ear pads Certification: ASTM F 2040, CE EN 1077:2077 Class B Weight: 17.5oz/ 450grams Compatible with Outdoor Tech(TM) audio systems (audio system not included) 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. M: 55-59cm L: 59-63cm