Designed for long runs on uneven trails, the inov-8 TrailFly Socks Mid (Twin Pack) offers comfort and protection in the areas you need it most. With targeted cushioning underfoot providing protection on unpredictable terrain and a snug fit, this sock is so comfortable you will feel like you can run forever. The highly breathable, moisture-wicking fabric features vented panels around the midfoot, helping keep the foot dry and comfortable.