218421ORA__41 Features: Move confidently over rugged terrain as the Vibram rubber soles are GSB crampon compatible to built with a Pebax insert and strong tread Your feet are kept warm inside the thermo formed liner boots, and protected from the elements via the full-zip waterproof and protective uppers Keep snow, water and ice from creeping in with an integrated nylon dynatec gaiter with a waterproof and breathable membrain Don"t worry about catching your gear or a rock to these boots have abrasion-resistant internal side reinforcements Specifications: Weight per pair: 5 lb 7 oz Upper: synthetic Midsole: Proflex Outsole: Vibram rubber Insulation: thermo liner