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I haven't used them, but Pedag makes some interesting insoles. They are wool and contain other materials (aluminum reflective layer, cork, etc) depending on which model you get. Let me know what you get and what you think of them ... I'd like to find some better insoles for my Cabela's hiking boots that I wear ice fishing quite a bit. They are very warm for a leather hiking boot (1200g), but it would be nice to have a little extra insulation between my toes and the ice!