Features ASTM Certified Safety Ski Helmet designed for both comfort and safety. Equipped with reinforced ABS shell & shock-absorbing EPS core. Airflow Ventilation Channels The ski and snowboard helmet comprises 14 individual vents for hours of comfortable skiing. No more over-heat! Stay Warm & Comfortable Removable ear pads help you adjust to the temperature easily. These removable ear pads & inner fleece liner are comfy and super easy to clean! Adjustable Size Size adjustment dial for a perfect fit. Ski helmet size chart: S: 19-20.5 inches (48 - 52cm) M: 20.5-23 inches (52 - 58cm) L: 22-24 inches (56 - 61cm) XL: 23.6-24.8 inches(60 - 63cm) Our snowboard helmet sizes are exclusive from youth to adult.  Official Supplier of the U.S. Ski & Snowboard Team Although the brand is young, we have become an official supplier to the U.S. Ski Team with our innovation and reliable quality. By sponsoring USCSA (US Collegiate Ski & Snowboard Association), we also support young people to inspire their potential. Choice of Professional Athletes Many professional athletes have been impressed with the quality and technology of Outdoor Master products and have chosen to become ambassadors for our brand. We also constantly improve and upgrade our products through feedback from our athletes in training and competition.