This article is from the Hiking Boots FAQ, by Chris Gilbert firstname.lastname@example.org with numerous contributions by others.
It's logical to chuck in a short discussion about socks when talking
about buying boots. Unfortunately there's loads of different ones
and you can't really try them on and take them back in the same
way you can boots. It's unlikely that you'll find your preferred sock
the first time you buy. It may take years which is a pain when these
days walking socks cost a pretty penny. As a general rule, modern,
cushioned walking socks are designed to be worn as a single pair but
if a single pair does not afford your feet either the protection or
the comfort that you require then consider wearing a pair of thin
inners underneath them. You can buy sepcial inners, they'll be on
the same shelf as the outers, but these are expensive and you may
just require a thin pair of cotton sports socks. The theory is that
the inner and the outer will move relative to each other as you walk.
This significantly reduces the risk of abrasive blistering. Beware,
however. In hot weather this combination is likely to cause excessive
sweating which in itself can lead to blistering. Reputable names in the
sock manufacturing arena include both Thorlo and Bridgedale. They are
not cheap. You get what you pay for.