The BOGS&'; Men&';s Classic SEAMLESS boot, inventively redesigned without seams between the outsole and the upper (where boots tend to fail), they&';re lighter and at 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 Yulex natural rubber waterproof insulation and 2mm of air mesh for temperature regulation Rebound cushioning provides all-day comfort and energy return Self cleaning, slip resistant BioGrip outsole DuraFresh natural bio-technology activates to fight odors Comfort rated to -40AdegF/-40AdegC Specs SKU #:73341-001