The Ranger 10" Flintlock III Zip Boots were built to take on whatever cold winter weather brings your way. These boots are waterproof to the stitch line of the upper TPR shell, and the 400 grams of Thermolite insole provide superior warmth up to -50 degrees Fahrenheit. An Ultra-Trac molded outsole provides stability and molded-in heel kick-off allows for quick boot removal.