For comfort into the negative digits, trust the Kamik(R) Men's NationPro waterproof winter boots. These lightweight synthetic rubber boots are lined with 200g insulation and outfitted with a gusset tongue to seal out moisture from snow and slush and lock in body heat for lasting warmth. TECHNOLOGY: Removable 200g 3M(TM) Thinsulate(TM) insulation liner DESIGN: Waterproof and flexible synthetic rubber shell Waterproof leather upper Waterproof gusset tongue Moisture-wicking lining SNOWTREAD synthetic rubber outsole DETAILS: Comfort rating: -40degF Height: 11.5'' Weight: 3.6 lbs per pair