Sock of Choice for Backcountry Skiing
I started using Bridgedale socks about ten years ago and still own my first pair. They are well made (understatement), comfortable, hold their shape, warm and snug without being too tight. I like warm feet for backcountry skiing, so I wear a thick sock like this and mold my liners a bit loose.
The computerized weaving on these socks is amazing as it puts the warmth and padding where you need it, and keeps them trim where you don't.
There are probably other good socks out there, but Bridgedales are amazing, so I keep going back to them.