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Mountain Equipment says:
A lightweight and protective waterproof shell with hybrid GORE-TEX construction for trekking and backpacking in the mountains. GORE-TEX 75D and GORE-TEX PACLITE® fabric are combined to give a lightweight, comfortable shell that retains the durability required for regular use with a pack. Our Alpine fit is completely unrestrictive for all day use and the proven Mountain HC Hood is a reliable refuge in the worst weather.
Material & Construction