Smith Optics Unisex Adult Venue Snow Sports Helmet Airflow climate control, 14 vents, removable goggle lock Lightweight in-mold construction, airevac 2 ventilation, snap fit ear pads Adjustable helmet fit system, skull candy audio systems available Size small 51-55-Centimeter, medium 55-59-Centimeter, large 59-63-Centimeter X-large 63-67-Centimeter, Certification ASTM F 2040, CE EN 1077:2007 CLASS B, weight 15-Ounce