The new Arctica with ice hook technology is the first winter boot to keep you on your feet in icy conditions! Waterproof and durable. Keeps your feet warm and dry all winter long. Soft flexible Vylon uppers and waterproof membrane foot. 3M Thinsulate insulation inner lining and moisture-wicking synthetic lining. Features winter grip outsole with retractable Ice Hook technology for stability and traction. Integrated reflective panels and sturdy, durable YKK zipper. Constructed of the advanced Vertycore shock reducing technology for lightweight cushioning and all-day comfort.