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Many factors play into this your fitness level, how well the boot lining and your sock system (liner and outer sock) wick move moisture to the out side or top of boots to be evaporated,etc.
cold feet ? jockeys
No they make merino wool socks ..news to me...75% woolhttps://www.jockey.com/catalog/product/jockey-mens-made-in-america-medium-merino-wool-hiking-crew-sock