Runs true to size - Baffin suggests sizing up if you wear a half size.Upper:Tall height, nylon upper with locking snow collar to protect from the elementsDouble buckle fastening for added securityBase:Arctic™ Rubber shell to provide lightweight flexibility, cold-resistance and resilienceEVA midsole for light-weight insulation and cushioningPolar Rubber® outsole for maximized grip and longevity of boot at cold temperaturesInsulation:Removable Comfort-Fit multi-layer inner boot system featuring:Thermaplush™ soft, next-to-foot wicking layer for warmthForm-fitting B-Tek™ Foam lining for comfortB-Tek™ Heat lightweight, 4-channel hollow-fibre insulation for high-loft breathability in a broad range of temperaturesVapourized Aluminum Membrane for energy reflection and heat regulationPolyWool polyester wool blend for breathable warmthHydromax™ layering for improved moisture managementDiamond Net insulation for wind-resistant protection with a lightweight feel