Ski helmet: The ATMOS belongs to the Bollé ECO design series - made from recycled materials. Very lightweight helmet with In-Mold construction with EPS (20% cork) - INMOLD SHELL. 100% recycled tapes and pads, plastic parts made of 100% eco-friendly nylon. adjustable ventilation system for maximum comfort - ADJUSTABLE VENTILATION. AVID PROGRESSIVE EPS makes the helmet more durable with improved ventilation. The helmet size is adjustable with the patented CLICK-TO-FIT system. removable lining, can be machine-washed at 30 degrees - DETACHABLE LINING removable 3D ear pads - REMOVABLE EAR PADS; adjustable chin strap - CHIN STRAP.