SMITH Vantage MIPS Snow Helmet, Black plastic AirEvac 2 ventilation allows your goggles and helmet to work as one fully integrated system_"constant airflow drives warm air away from your goggles through external vents and internal channels to keep your lens clear. Hybrid Shell construction combines tough Bombshell ABS construction and superlight in-mold technology to deliver a lightweight, low-profile, perfectly fitting helmet. Snapfit ear pads provide a comfortable seal from cold weather; easily removable for maximum cooling on warm spring days. Goggle clip on the back of the helmet keeps your goggles secure, even after sending it head-over-heels through blower powder; removable for weight reduction or a cleaner silhouette when wearing your goggles underneath the helmet. Sleek, low-profile brim provides extra protection against sun and weather. Compatible with Skullcandy audio systems (not included). Sizing:. Small, 51-55 cm. Medium, 55-59 cm. Large, 59-63 cm.