Columbia Men's Bugaboot Neo Mid Omni-heat Snow Boot 100% Textile/Rubber Imported Rubber sole Shaft measures approximately 11.75" from arch Boot opening measures approximately 15.25" 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.