It's hard to hold on to your poles when your hands are frozen, but the Hestra Power Heater Mitten has a hot-'n'-toasty trick up its sleeve--integrated heat loops, which wrap around your hand to provide battery-powered warmth on the coldest ski days. There are three heat settings, controllable via the built-in control panel, along with replaceable and rechargeable batteries that make it easy to keep the heat on full blast for your whole trip. An included international adapter means you can charge your gloves wherever you're skiing, whether you're in Japan, Europe, or North America. The Power Heater is still a Hestra, too, so it has all the construction and durability you'd expect. The shell is made from tough and supple Flextron nylon, with an impregnated cowhide palm and brushed polyester lining. The integrated CZone waterproof membrane keeps your hands from getting soggy and the Power Heater's electronics from shorting out. There's synthetic insulation as well, which keeps the heat from escaping, so your batteries last longer, and your mittens still work even if you forget to charge them up overnight.