Built with pro-grade durability for alpine conditions, the 509 Velo Raid Boot is for sledders and snow bikers seeking more support and protection with minimal bulk. It features a taller profile to guard your shins, plus the ease of a motocross style three-buckle closure. The 5TECH waterproof lining with 200 3M Thinsulate insulation keeps you warm and dry on the deepest days. Shifter pads and a carbon-blend mountain lug sole ramp up strength in critical zones. 3 Buckle boot construction