I bought this for my friend who sometimes has to work 8 hour shifts outside in the harsh temperatures of the Upper Peninsula (Michigan). He asked for a good thermal and I loved their description saying they were meant for extreme climates. So far, so good. He wears them under his uniform and said they're great at blocking wind (his other thermals let wind through) and keeping him warm. I would say they are a bit small; I ordered them medium (his normal size) and they look a little snug. He hasn't complained about the fit though, so I don't think they're far from ideal.
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