For sleeping, I usually use liner sock, plastic bag and then fleece sock. This is pretty warm and you can layer as necessary. I have used the Sealskinz to sleep in and they are also warm, I would guess they are equivalent to the sock, plastic bag and fleece sock combo. Thick means warmth, a vapor barrier helps alot and SealSkinz are just reduced efficiency vapor barriers. Beware of sleeping ONLY in hiking socks that have thick and thin parts (like thick heels and toes)... the thin parts are lacking in insulation and result in cold feet when sleeping.Originally Posted by GolfHiker
Youngblood