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The Smith Vantage Evolve snow helmet features a partially recycled lining and the Boa(R) fit system to maximize protection for aggressive, big-mountain descents. Hybrid shell fuses polycarbonate and ABS plastic, creating superior protection with minimal weight. Ventilation system maximizes airflow to reduce performance-inhibiting goggles fogging. Airflow travels from goggles, through internal channels in the foam and out through 21 external vents. Sliding tab opens and closes vents in front and rear of helmet; vents are easy to adjust, even with gloves on. Boa lacing replaces traditional helmet fit systems to provide an even fit without pressure points. With a simple twist of the knob, Boa retracts loose cable and dials in a quick, secure closure. Removable strap on the back secures goggles to the helmet. Partially recycled lining inhibits odor retention, regulates temperature and minimizes static; antimicrobial silver ion treatment is permanently bonded so it will not wear off. Minimalist, lightweight Snapfit ear pads are soft and comfortable; remove the pads on warm days or to wash. Smith Evolve Vantage snow helmet is compatible with Skullcandy(TM) Bluetooth(R) Audio Drop Ins, Direct Connect, and Single Shot audio systems, sold separately. This snow helmet complies with ASTM F 2040 and/or CE EN 1077 alpine ski and snowboard helmet safety standards; for additional information please see REI expert advice.