Comprised of Full Grain Crazy Horse leather with an insulating 6mm CR Flex-Foam bootie, the Peak Hardcore provides lacing controlled support with serious warming insulation. Rated at minus 40 degrees, you can walk long distances, shovel snow or ice fish in this waterproof boot. Extremely lightweight and durable, the Spandura exterior will last many seasons. You'll find sure-footed trekking with the aggressive and gripping outsole that work well on all types of surfaces. This versatile boot is ideal for hiking, or most any outdoor sporting activities. Material: Leather.