The Arrowhead UltraDry™ is an athletic,8-inch backcountry burner. As you'd expect,building an agile winter performance boot takes more than insulation. Loaded with dedicated snow features,it includes a full-coverage shroud which shields the gussets from ice and crud. The asymmetrically-zipped boot top and single-pull Kevlar® lace system keep the boot smooth for snag free snowshoeing and scrambles. UltraDry™ locks out moisture,a reflective lining locks in heat,and the highly-technical Venture outsole with ColdHold compound locks you down in the backcountry. 200g of 3M™ Thinsulate™ insulation keep you warm,and the boot includes a water resistant zipper,speed lacing,and molded rubber heel kick.The ColdHold compound sole is a dual density rubber optimized for superior traction in cold environments. Harder,sharper lugs line the perimeter of the sole offering positive bite into snow and frozen turf while the center lugs remain pliable in cold temperature,conforming to irregularities of terrain. The UltraDry™ waterproofing system combines a moisture management lining with waterproof components for dry,long-lasting comfort and performance.Fit Profile: The Arrowhead UltraDry™ is built on the Perpetuum last. This last is formed on a straighter line for people with flatter feet,with a broad toe box,tailored instep,and a lower heel volume than the Arc Tempo's medium volume. The last is stable and comfortable for going the distance,and the broad toe box is ideal for endurance activities because it allows the forefoot to expand naturally. A tailored instep locks the foot securely in place to minimize foot movement,reducing friction. The Perpetuum last works great on your feet all day,whether running,hiking,or standing.Additional InfoWaterproof,Insulated,Thinsulate,Winter