These exceptionally warm socks are made from a luxurious blend of alpaca and wool. The material is soft, supple and smooth. Microscopic air pockets act as insulation to keep warmth in. There is no tight elastic at the top to compress or constrict, meaning these socks are ready to rock all day long! One size fits most. 60% Alpaca, 20% Wool, 17% Nylon, 3% Lycra. Short, warm wash on medium cycle. May be tumble dried on warm only. Do not bleach. Do not professionally dry clean. Do not iron.