Special engineered Thorlo® Anti-Fatigue socks feature exclusive THOR•LON® construction for DURABILITY and SUPERIOR MOISTURE MANAGEMENT. Exclusive THORLON yarn promotes circulation and holds top in place. Unique padding in the ball and heel for enhanced mobility and maximum protection, clinically shown to reduce blisters, pain, pressures and moisture. Flat knit instep and cushioned arch for a better fit and support. Fiber content: 85% THOR•LON® acrylic, 9% nylon, 6% elastic. Made in USA of domestic and imported yarns.