Be free as a bird with the Earlie Birdie socks! Ducks are among the most versatile animals in the world - they can fly, swim, dive and walk. And with these socks, you'll have 3 out of 4 of these skills too! The socks are made of 100% cotton, and sit very comfortably while being durable and machine-washable. The socks come in sizes 36-40 and 41-46, European.