Baffin Vanguard Boot - Men's Synthetic Imported Shaft measures approximately 15 from arch Temperature Rating: -100&deg; C/-148&deg; F Liner: Removable, multi-layer inner boot system featuring double B-Tek insulation, a double aluminum insole and a waffle-comb foot-bed Base: Arctic rubber shell, EVA midsole, polar rubber outsole Waterproof Diamond-Lite insulated nylon upper Lower shaft multi D-Ring lace up fastening