Columbia Men's Bugaboot Neo Tall Omni-Heat Snow Boot Waterproof Neoprene / Rubber Imported Rubber sole Shaft measures approximately 15" from arch Boot opening measures approximately 17" around Omni-Grip non-marking traction rubber. Techlite lightweight midsole for long lasting comfort, superior cushioning, and high energy return. Omni-Heat reflective lining. A combination of waterproof Neoprene and Rubber. Rated -40F/-40C.