Easy on and off VELCRO closures with D ring Nubuck leather upper, and woven and waterproof knit I600g synthetic insulation Waterproof lining Comfortable sock microfleece lining Aggressive Ice Lock outsole Easy on, easy off, and packing warmth, the 509 Youth Rocco Snow Boot is the ultimate winter boot for kids who thrive in winter. Whether snowmobiling or having an epic snowball fight, 600g of insulation, waterproof Nubuck leather, and a comfy micro fleece lining keep things warm and dry while an aggressive outsole keeps things more “thrill” than “spill”.