These are one of the best purchases I've ever made.
Winter riding leaves you with cold feet, I've tried two pairs of socks but they are too tight in my shoes so my feet go numb.
Tried Skins, while they work to some degree they don't fit snuggly, a bit thicker so a little tight and let air in.
I have found the Lucifers to be light, 99% warm, snug and fit nicely in my shoes.
Even after river crossings where your feet are spongy wet my feet were cold but not the usual frozen.
Would definitely recommend.
Charcoal / M