Sierra Socks Men's OTC Nylon Support Hose Compression Travel Socks Made in USA 100% Nylon Machine wash cold. Only non-chlorine bleach when needed. Tumble dry low heat. Relieves tired aching swollen legs. Engineered for help with blood circulation. Great for those of us who are on their feet all day. Great for those of us who sit behind a desk all day or on a plane. 8-12 mm Hg compression.