Smith Optics Unisex Adult Vantage Snow Sports Helmet Plastic pull-on closure 11" high 11" wide Adjustable helmet fit system, removable ultra-light goggle lock, snap-fit SL ear pads Low-profile dual regulator climate control, 21 vents, airevac 2 ventilation Skull-candy, blue-tooth and twin-tip link phone/audio systems available, helmet size chart Certification ASTM F 2040, CE EN 1077 class B, weight 15.5-Ounce/ 440-Grams