The Giro Nine is always a best-selling helmet for snow sports. First because it is an incredible value, second, because it is loaded with features. The lightweight In-Mold Construction is very lightweight without any compromise to safety. Thermostat Control allows you to regulate your temperature by opening the vents with the switch on top of the helmet to let moist, warm air out, and cooler air in. Vertical Tuning gives you the ability to adjust the forward lean of the nine for that perfect fit for your goggles, but that is not necessary if you wear Giro Goggles, because the Nine is seamlessly compatible with all Giro Goggles. The In-Form Fit System provides up to 6cm of adjustability for a safe and secure fit. If you are looking for an economic helmet that works with any ski outfit or style, find out why the Giro Nine is always a top-seller today. Thermostat Control, Stack Ventilation, In Form Fit System, In-Mold Construction, Seamless Compatibility with all Giro Goggles, Vertical Tuning, SM-52-55.5cm, MED-55.5-59cm, LG-59-62.5cm, XL-62.5-65cm, Certifications: ASTM F2040-11 / CE EN1077, Warranty: Lifetime, Race: No, Category: Half Shell, Audio: Audio Compatible, Brim/Visor: Yes, Ventilation: Adjustable, Adjustability: Full, Year Round Capable: No, Shell Construction: In-Mold, Model Year: 2018, Product ID: 451709, Model Number: 7072085, GTIN: 0768686702174