Rocky Jasper Extreme Men's Winter Boot. Snow is no obstacle with the Rocky Jasper Extreme boot. A water resistant nylon and leather shaft with an adjustable snow cuff. Freeze chamber keeps frozen condensation away from foot. Removable 9.3mm felt liner with heat reflection material to keep you warm. New Jasper X-treme outsole is designed with snowmobile treat to give fantasic traction in the coldest conditions. # Durable Nylon # Freeze chamber # Fully adjustable snow cuff # Waterproof Construction # Rated to -40 degrees F # New rubber outsole with high sides