Design/Technology: 9 fixed vents for regular airflow Plush lining for comfortable, warm feel Removable Snapfit SL2 ear pads for warmth with Aleck(TM) audio system compatibility Goggle strap lock removable for streamlined construction when goggles are also worn Self-adjusting lifestyle fit system that flexes to your head shape for optimal comfort AirEvac(TM) ventilation system to accommodate Smith(R) goggles to minimize fog Exterior shell fused with EPS foam for 1-piece design Contoured to better fit round heads Safety Features: Certain colorways available without MIPS(R) system Certification: ASTM F 2040, CE EN 1077:2007 CLASS B