Our improved model in medium weight. Sheep and alpaca wool are incredibly warm. Cotton and hemp are notoriously durable. By combining warmth and durability we created socks that could withstand long-wearing while still being all-natural. The cotton and hemp are cleverly interwoven on the inside and the wool is on the outside of the foot, so they are more durable and softer to the skin. They contain no synthetic content and the wool is not treated with chemicals making them healthy for your skin as well. Because they are made from completely breathable fibers they don't hold odour or cause you to sweat like synthetics do. COMPOSITION - 55% untreated sheep wool - 30% untreated alpaca wool - 12% unbleached and undyed cotton - 3% hemp WASH - These should be ideally hand washed (or machine washed on a delicate cycle at 30° with a gentle wool detergent). - Do not tumble, dry clean, iron or bleach - Hang to dry