Soft Luxurious Comfort - Doesn't Itch. Eliminates moisture better than synthetics. Warm in Winder-Cool in Summer. SmartWool places ONLY 100% Super Fine Grade Merino Wool next to your skin to provide the most comfort and best performance. For superior fit and maximum durability, SmartWool adds stretch nylon to the socks outer layer. Content: 80% Wool, 17% Nylon, 3% Elastic |