I can't believe I've never heard of Lorpen
I wansn't sure who Lorpen was but a buddy suggested I try these as my Smartwool socks were beat. Great sock, loved it! I like the different densities in zones like the shin bone and the bottom of the foot. These are not ultra-thin as described but they fit very comfortably in my backcountry skiing boots (Scarpa Spirit 3) or my alpine boots which are form fitted Surefoot liners (Head Race boots). Durable and long lasting (I've owned this pair for a year now with 60 days of skiing - no holes or flaws) I'm definitely sold on Lorpen socks.