In reply to wbo:
> try a few different to see if you prefer thick or very thin. I like Nike dri fit thin socks - no problems, last ages longer than most others
Nike dri fit seem to be pretty much indestructible, although if buying cheap from an outlet check the sizes (mine were US not UK sized..). I like them for road runs, but prefer something a bit thicker for off road. I quite liked tge Alpkit double socks, but have the odd issue with being unable to stop the inner sock rucking up inside the outer.