PLEASE NOTE: Columbia shoes are in US sizing. Columbia Bugaboot Max Electric Boots features an Omni-Heat insulation and reflective lining upper, Omni-Heat electric for push-button warmth, Waterproof laces and metal lace hooks, TPU side panel design and translucent eyestay frame, Techlite EVA with oversized heel shell and midfoot TPU shank for stability and Omni-Grip traction rubber outsole.