This high-performance snow helmet has a hybrid shell featuring a lightweight in-mold construction that fuses the exterior shell and EPS foam for a durable, one-piece design.What it does: Nine vents and AirEvac ventilation regulate your temperature with ease, so you can keep skiing or boarding all day long.Additional features: The Method Helmet features a micro-adjustable dial fit system for easy, on-the-go size adjustment. AirEvac ventilation drives warm air away from your goggles and out of the helmet through internal channels and vents. Removable Snapfit SL2 ear pads add warmth and are audio-chip compatible. A removable goggle strap locks for a streamlined shell when goggles are worn under helmet. A magnetic chin strap buckle makes for easy one-hand operation.Safety features: Zonal KOROYD® coverage provides lightweight, energy-absorbing and ventilated impact protection.Compatibility: Beanie compatible. Compatible with Aleck™ audio systems. Designed for ultimate integration with Smith goggles for maximum comfort and venting (sold separately). Complies with ASTM F 2040 and/or CE EN 1077:2007 Class B alpine ski and snowboard helmet safety standards Polycarbonate Imported CA WARNING: this item can expose you to BPA, known carcinogens and/or reproductive toxicants. See below link for more details on Proposition 65