These were the best investment I made last winter - http://www.ebay.co.uk/itm/6-Pairs-Merino-Wool-Ulvang-Hiking-Walking-Socks-only-7-99-free-post-to-UK-/251527539832?pt=UK_Sporting_Goods_Sports_Clothing_LE&var=&hash=item3a9035ac78
They look very similar to the some Defeet Merino socks I own (which are very good – very thin but still warm).
@TooTallTim started
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These were the best investment I made last winter - http://www.ebay.co.uk/itm/6-Pairs-Merino-Wool-Ulvang-Hiking-Walking-Socks-only-7-99-free-post-to-UK-/251527539832?pt=UK_Sporting_Goods_Sports_Clothing_LE&var=&hash=item3a9035ac78