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In -20 and below you don't want to be worrying about getting wet and cold especially if you are responsible for others. I used these Woolpower Long Johns in the Arctic Wilderness during the month of January as an instructor on a survival course, this equipment was an essential on my kit list. I recommend this base layer to all our customers if they are joining us on a course because safety is important especially in extreme temperatures and I would only recommend equipment if I have used it myself successfully. During the 4 day expedition my lower body stayed dry even while hiking long distances with snow shoes and dragging a sled behind with all my camping and survival gear.
Maxwell Kimberley-thompson24th August, 2019