The Kamik Greenbay 4 boots are perfect for trekking through this snowy season in total comfort. Snow boot made of a waterproof 600D denier nylon upper with a waterproof, lightweight RubberHe synthetic shell foot. 8mm Thermal Guard removable liner provides a warm and comfortable interior and is made of 100 percent recycled materials. Temperature rated: -40 degreesF/-40 degreesC. (Temp conversion is correct). Moisture-wicking lining provides added breathability. Slip-on boot with an adjustable snow collar and bungee lace lock. Adjustable midfoot hook-and-loop strap. Pulse injected TPR outsole. Non-marking PRIME lightweight synthetic RubberHe outsole for excellent traction on icy snowy surfaces. Made in the USA of imported materials. Measurements: Weight: 2 lbs 4 oz Circumference: 20 in Shaft: 13 in Product measurements were taken using size 9, width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.