SIGVARIS Merino Outdoor Cushioned Wool Socks 20-30mmHg (Charcoal) Medium Short. DURABLE MATERIAL: The knee high socks offer a great look and comfortable feel. The 67% fine merino wool, 26% nylon, 7% spandex double-covered inlay yarns provide softness against the skin while remaining extremely durable 422 Merino Outdoor Performance Socks are made with natural Merino wool that is soft, comfortable, and itch-free. They are also odor-resistant and cushioned. These socks are ideal for outdoor sportswear and can provide relief from discomfort and increase blood flow.