Keeping you warm down to -100 degrees F. We here at Sportsman's Guide® salute workers like you who brave dangerous cold to get the job done... whether repairing utility poles or simply ice fishing. And Kamik® is here with Boots to handle the elements to keep you safe and comfortable. A WHOPPING 20MM OF WARMTH. It's all about the Zylex 4F liner. First, there's a 2mm polypropylene moisture-wicking layer. Next, 12mm foam combines with 4mm polyester felt for insulation. Finally, there's a 2mm thermal foil barrier layer. All that adds up to a comfort rating of -100 degrees F. RUGGED BUT LIGHTER THAN YOU'D EXPECT. RubberHe makes these boots light like helium but tough like iron... but still flexible in all temps. And the waterproof 1200 denier nylon uppers are ready to fight-off winter's worst. Quite simply, these Winter Boots aren't playing around. Removable 20mm Zylex 4F liner for total warmth; RubberHe outsole and shell is oil and acid-resistant, gives superior traction; Adjustable mid-foot bungee lace lock and snow collar for perfect fit; Built in the USA; Height: 14.5"; Weight: 40 oz. each; Don't mess around in dangerous cold. Protect yourself in these Kamik Winter Boots!KAMIK