With 400 grams of Thermolite insulation rated to -40 degrees Fahrenheit you can guarantee cold weather comfort in the Raptor 400 hiking boot from Northside, while a tough, brushed rubber toe cap and heel guard fends off abrasion along the trail.Item # 544862400g Thermolite insulation rated to -40 degrees FahrenheitBoot shaft height: 9½ inchesBrushed rubber toe cap and heel guardCushioned footbedLace entry with metal D-rings and top hooksLeather upper with nylon collarPadded tongue and collarRubber outsoleSeam-sealed waterproof membraneTextile liningWaterproof