ThorLo T-11 tennis socks feature high-density padding in the ball and heel of the foot, providing protection against concussion while it absorbs shock from heavy foot strikes on hard court surface. Low density padding over the toe protects against abrasion caused by sudden starts, stops, and lateral movements. Low-density padding in the arch provides the protection and comfort needed for those long matches. A flat knit instep provides less bulk, better shoe fit, and allows for rapid moisture evaporation. 87% Thor-Lon acrylic, 12% stretch nylon, 1% spandex. Made in USA.