Nike Run Anti Blister Quarter Running Socks (Twin Pack) Reinforced Heel and Toe - For enhanced durability in high-wear areas. L and R Specific Socks - A specific fit is a better fit with each sock anatomically shaped to fit a certain foot. Arch Support - For a better, more secure fit. Mesh Panelling - For great ventilation, keep your feet dry and comfortable. DRI-FIT - Nike fabric which helps to wick away sweat and keep moisture out.