The Head Pro Series Snowboard Helmet. Key Features of the Head Pro Series Snowboard Helmet: In-mould technology - Allows the unlikely marriage of the lightweight plastic (Polycarbonate) shell and a protective impact resistant EPS (expanded Polystyrene) layer Thermal ventilation - Provides excellent ventilation without forward movement - perfect for hiking up the edge of a half pipe or into the backcountry Microfleece one piece lining - With a soft touch finish to provide great comfort Removable vent dams - Makes every cold day on the hill warm and toasty Removable leather ear pads / neck gator - For more comfort and a better fit. Different soft touch materials to underline a cozy, warm feeling Certification CE En 1077 / ASTM F 2040 Matte finish 379 g approx weight Helmet Size Circumference (cm) Medium 55.5-57 Large 57-59 X-Large 59-60.5 XX-Large 60.5-62.5