"Basketball Thorlos are engineered for top performance in this strenuous court sport. The high-density padding at the ball and heel protects against concussion, while absorbing the shock of heavy foot strikes. Heavy padding extends under and up the heel to protect the Achilles tendons, while a lower density over-the-toe pad offers additional protection against quick starts, stops, and lateral movements. See BX-11 for shoe size 5 1/2 - 10 1/2 & BX-13 for shoe size 8 1/2-12 1/2 88% Acrylic, 10% Stretch Nylon, 2% Spandex"
