On Running Performance Low Sock - On Running Performance running socks are a training and competition model that will work well on warm days. Made of technical, breathable materials that come from recycling. The special pattern supports and stabilizes the arch of the foot, and the entire structure gently wraps the foot without unnecessary pressure. Mesh panels allow for more efficient removal of excess heat and moisture. Ankle-style cut with an elongated heel so that the shoe does not irritate the Achilles tendon.