MuckBoots Men's Refresh Round Up Boot 100% Synthetic Imported Rubber sole Shaft measures approximately 6" from arch Heel measures approximately 1.25" Platform measures approximately 0.75" Boot opening measures approximately 11.5" around 100 percent waterproof full grain leather Fully insulated with 6 millimeter CR flex foam which provides optimal warmth Etc socklining to reduce friction and heat build up New comfortable expresscool lining material keeps your feet cool and dry in warm weather Wide cut heel base for stability