Lightweight Ski helmet: The Bollé ATMOS MIPS L (59-62 CM) has In-Mold construction with EPS. The helmet has an adjustable ventilation system for maximum comfort - Avid Progressive EPS makes the helmet more durable and has improved ventilation. In case of a fall, the MIPS liner inside the helmet allows for slight movement against the shell of the helmet to absorb rotational energy, The result is a significant reduction in the forces that would be transmitted to the brain. The helmet size is adjustable with the patented CLICK TO FIT system.