Columbia Women's Snowpow Mid Omni-Heat Snow Boot 100% Textile and Synthetic Imported Synthetic sole Shaft measures approximately 9.5" from arch Boot opening measures approximately 15" around Omni-Grip non-marking traction rubber. Removable contoured PU footbed. A combination of waterproof Neoprene and Rubber. Rated -40F/-40C. Omni-Heat reflective lining.