The Summit and Summit Zero are essentially the same jacket, the only difference is that the Summit has a thing fleece lining, and the Summit Zero is just a shell. I'm just wondering how much of a difference that lining would make in terms of heat. Is the hood stiff enough to stand up on its own, or is it really thin and flimsy? Toronto does get colder than Vancouver in the Winter, but it also gets Hotter in the Summer. I've lived in Toronto for four years, now, and I've seen it it -40 in the Winter and hit +38 in the Summer.
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