Hilly 1/4 Crew Running M Fresh Anklet, Grey/Orange/Black, X Large with a sock ring Specifically designed for running between 5K and Marathon. Polygiene particle (Silver Chloride Particles) for Permanent Odor Control. Nid-Level anatomical cushioning in key pressure zones for optimum comfort. Upper foot venting, Under toe seamless construction. Comes with a Sock ring that helps keep track of your socks and keep them together in the wash so you don't loose the matches