The versatile Arctic Sport is a popular MuckA(R) style! The CR Flex-Foam insulates and remains flexible, even down to -40AdegF. It keeps snow and slush out, too. And the outsole is built for traction on snowy surfaces. So you stay warm and dry in the snow and cold while shoveling, exploring, getting firewood, or just heading to work. Plus, with an extra layer of 2mm thermal foam underfoot, you have additional warmth while ice fishing or standing around for long periods of time. 5mm CR Flex-Foam, additional 2mm thermal foam underfoot combine for total warmth MS-1 molded outsole is built for traction especially on wintry surfaces Stretch-fit topline fits to calf to keep cold out and warmth in Warm fleece lining EVA contoured-molded midsole Comfort range of -40AdegF to 40AdegF Cruising through a winter wonderland! Get the Arctic Sport right here.