Gore-Tex Duratherm membrane provides waterproof performance and insulation to roughly minus 10 degrees Fahrenheit * The 3/4 rubber rand protects 2.8mm of Zamberlan hydrobloc full grain waxed leather and ensures your boots will last for years to come with proper care * Vibram StarTrek sole features dual density polyurethane support with a TPU stabilizer over the arch for excellent grip, comfort and performance