High performance sport boot with stretch-fit topline binding snugs let to keep warmth in and cold out. Fleece-lined, 2mm thermal underlay adds insulation on the inside. MS-1 molded outsole and wrap-up toe bumper provides traction, durability, and protection on the outside. 100% waterproof, lightweight and flexible. Comfort range of -40 deg (degrees) F (Fahrenheit) to 40 deg F. Double reinforcements on the instep, heel and Achilles areas.