Columbia Women&#39;s BL3427 Coremic Ridge Mid Hiking Boot,Tobacco/Martinique,10 M,Columbia" /> 100% Suede, synthetic, and mesh Rubber sole Shaft measures approximately 4 1/4" from arch Boot opening measures approximately 8 1/2" around Full-length lasting board provides support and protection Molded nylon stability shank provides torsional rigidity and support Treaded, non-marking Omni-Grip cupsole