One of the industry's bestselling helmets ever, the 509 Altitude Snowmobile Helmet series excels across four key principles: safety, performance, fit, and style. Revolutionary design means precision fit and sleek profiling that exceeds the competition, plus innovative venting and all-day comfort for aggressive riding. The 509 Altitude Helmet is equipt with Fidlock® magnetic strap buckle for easy one-handed operation, plus customizable elements like a removable cold weather breathbox.