FootSmart Men's Microfiber Nylon Moderate Support Over-the-Calf Socks 80% nylon Goes over-the-calf and provides an exceptional, comfortable fit with added softness in an incredibly durable sock. Moderate graduated support begins at the ankle and stimulates circulation to relieve aching and swelling. Graduated Support Level: Moderate 15-20mm / Hg. Yarn Content: 80% nylon, 20% spandex. Note: Light to moderate support products are recommended for first-time wearers.Made in USA. Care: Machine wash on gentle cycle. Lay flat to dry.