From Zappos.com: Roam the winter scene in total style and complete comfort when you wear the SOREL® Caribou™ winter boot! Waterproof nubuck leather upper. Seam-sealed waterproof construction keeps out the wet elements for a drier, more comfortable foot environment. Removable 9mm ThermoPlus® felt InnerBoot provides superb warmth, moisture transfer, comfort, and durability. Sherpa Pile snow cuff for added warmth. 2.5mm bonded felt frost plug in the shell to provide an extra layer of insulation and warmth. The frost plug is a 2.5 mm piece of EVA that is in the heel and forefoot. Handcrafted, waterproof, vulcanized rubber shell. Sorel aero-trac non-loading outsole for excellent traction and grip on snowy terrain. Imported. Product measurements were taken using size 6, width B - Medium. Please note that measurements may vary by size. Measurements: Heel Height: 1 in Weight: 2 lbs 5 oz Shaft: 9 in