These socks are warm and a combination of wool, nylon, etc. My husband loves them and he wears the white (probably some shade of off white) socks for everyday in his work boots and the black socks for dress. I gave the socks four stars as they pill after being worn and washed even though I do not put them in the dryer.  We first found the socks at an army/air force base. We were surprised to find them on Amazon and best of all, they are made in the USA.