Built for runners putting in real daily mileage, the Performance Run Sock Mid is our go-to training sock for road and trail alike. A mid-cut design with targeted cushioning under the heel and forefoot keeps hot spots and slippage from killing your run, while the anatomical fit holds everything in place over long efforts. Mid-cut height adds ankle coverage and cuts down on debris entry whether you're on pavement or dirt Targeted cushioning zones under the heel and forefoot take the edge off impact without adding bulk Snug anatomical construction minimizes bunching and in-shoe movement — especially important on longer runs Solid daily trainer sock for high-mileage runners who need reliable performance in Southern heat and humidity Available in Black/Eclipse and White/Glacier in XS through L — works with On footwear or any performance running shoe