I was surprised to see only one other reviewer here mention the fact of these being liners, not just socks.  As straight socks, I would not be much of a fan of these, even in dress shoes.  Very thin, thinner than I prefer.  But for liners, these are absolutely fantastic.  The same thinness that makes me not want them as standalone socks (no pun intended) makes these great as liners.  These, under hiking socks, you don't even feel that they're on, but your feet get the benefits.