The BOGS' Men's Classic boot, inventively redesigned without seams between the outsole and the upper (where boots tend to fail), they're 30% lighter and at least four times more durable than the nearest competitor. 100% waterproof and surprisingly comfortable with sports Rebound cushioning. Even at forty below, these Classics were made to go the distance. Design: 100% waterproof seamless construction 5.5mm Neo-Tech upper provides medium-weight and waterproof comfort Air Mesh lining with Max Wick coating evaporates more sweat to keep feet drier DuraFresh natural bio-technology activates to fight odors Comfort range from -40degF to 60degF (-40degC to 16degC) for cold-weather warmth and three-season wearability