A change of socks is probably worthwhile (I know of LDWA peeps who change their socks every 20 miles on a '100') and, for winter, consider waterproof socks (they won't stay dry because of sweat) but they keep the wind out and keep you feet much warmer.
Look for LDWA events over the winter to get 20-25 mile sessions and 'eating practise' without having to carry food.







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