73347 Bogs Men's Classic Seamless Adjustable Calf 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. Features 100% Waterproof Built with Seamless Construction - making them lighter and more durable Constructed with 5.5mm bio-based Neo-Tech natural rubber waterproof insulation and 2mm of air mesh for temperature regulation Air Mesh lining with Max Wick coating evaporates more sweat to keep feet drier Self-cleaning, slip resistant BioGrip outsole DuraFresh natural biotechnology activates to fight odors Comfort ranges from -40°F to 60°F (-40°C to 16°C) for cold-weather warmth and three-season wearability EH-rated for electrical hazard safety Specs Weight: 4.9 lbs (pair) Height: 15.2" Calf Circumference: 18.1"