The warmest softest & longest lasting alpaca socks we have ever produced. These knee-highs are cushion looped & a gentle elastication around the arch of the foot ensures that they wont slip down inside your boots. These are a firm favourite especially for working from home over Winter. Sizing: One Size UK size 5-8 37-41 They contain the necessary amount of elastane & nylon to make them last. Made from: 45% Baby Alpaca 40% Acrylic 15 % Nylon. A higher ratio of baby alpaca would not be as durable. Care Instructions: Hand wash or machine wash on a woollens cycle at 30C & leave to dry flat. Do not tumble dry. Use a mild detergent. Wash in a mesh laundry bag to reduce agitation. This will avoid the alpaca socks getting stretched & losing their shape & prevents the machine eating them!