A lightweight boot thats built for the extreme cold. 1000D insulated nylon upper. 8-layer inner boot system with Thermaplush. Dual strap closures with buckles. Locking snow collar. Waffle footbed for cushioning and heat retention. 2-stage polyurethane and vulcanized Polar rubber outsole. Temperature rated for -100 degreesC/-148 degreesF. Measurements: Weight: 2 lbs 15 oz Circumference: 17 1 2 in Shaft: 13 in Product measurements were taken using size 10, width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.