"If you’re looking for a pair of heavy-duty waterproof hiking boots for winter, these are a great option to look into; Mammut describes them as “a shoe for hiking in snow and ice.” The boots have been outfitted with a fully waterproof PU membrane with bonded seams so that not a drop of moisture seeps in. (Actually, the combination of rubber used for the boot was made specifically for winter use.) And like any winter boot worth its salt, the Blackfin III’s inner shaft comes with aluminum insulation so you know you’re getting serious cold protection."