56% Nylon/38% Polyester/4% Cotton/2% Lycra Spandex. NB DRY moisture management technology quickly moves sweat to keep feet cool and dry. NB Fresh treatment with Silvadur keeps socks fresh and fights odors. Cushioned foot bed designed to minimize shock absorption. Stability Fit built in for enhanced arch support. Reinforced heel and toe for extra durability and protection. Stability Fit Arch Support & Hold. Soft Touch Spun Polyester. Lightning Dry Moisture Management. Reinforced Heel & Toe and Half Cushion. Anti-Microbial Finish to Fight Odor.