Thorlon acrylic fibers are specially spun to maintain both softness and resilience, while wicking away moisture * Moderate cushioning in ball of foot and heel reduces shock and impact, while helping to prevent blisters * Thorlon ball-of-foot pad prevents blisters and calluses from developing, while helping to relieve foot fatigue; Flat knit instep and thin cushioning at arch help improve fit * Helps relieve Blisters, Foot Odor, Foot Perspiration, Hyperhidrosis * Contoured heel and toe allow sock to fit shape of your foot, helping to eliminate irritation, bunching and slipping; Made in USA