I saw this in another thread:
And I find it hard to believe.* For sure, thick socks that don't fit in a boot being cold makes sense to me. Thick socks that allow the foot to move to much in the boot (thus jamming a bit) being cold makes sense to me.
But is a very thin sock - like "nylons" - really warmer than, say, a fairly thin (low cushion ski sock) or even moderate (medium cushion for skiing) sock, assuming they fit well in the boot. I've been cycling and XC sking i cold weather and don't see this at all in those domains.
How/why can this be?
* - makes sense that if someone has cold feet to check that the socks are not too thick for his boots.