DetailsLasting Size Chart RTF is antibacterial running sock made from single-layer plush. These socks maintain the natural bacterial balance under all circumstances and provide a pleasant feeling of freshness even during intense physical activities. Zones exposed to high stress such as the bottom, the toe and the Achilles heel area are reinforced with a double-layer material, which forms an impact-absorbing layer protecting the user from corns and calluses. The upper hem is wide and extremely flexible and pleasantly hugs the shin and calf without creating an unpleasant grip. Material: 40% microfiber, 40% polypropylene, 15% Nylon, 5% Elastane.