The Muck Woody Max Cold-Conditions Hunting boot has a comfort range of -40°F to 60°F. This boot has all the standard Muck Boot features plus much more. The MS-1 molded outsole is rugged, aggressive and durable for maximum protection and stability (men's boot). The rugged, durable, two-color MS2 molded rubber outsole is contoured to fit a woman's foot (women's boot). The stretch-fit topline binding snugs the calf to keep warmth in and cold out. The Inscentible scent masking for improved concealment when hunting. 2 mm thermal foam underlay is added to the instep area for additional warmth. This boot is fleece lined.