Made of durable TPE, the spikes fit almost every shoe model. Four of the eight robust and anti-slip stainless steel tips are positioned under the heel. The heel spikes are especially important because people lead with their heels when walking. The remaining four cleats are located under the ball of the foot and support the forefoot. This makes even iced over trails passable. The shoe spikes are equally suitable for womens' and mens' shoes. They are available in sizes S (shoe size 4 to 7), M (shoe size 7 to 9), L (shoe size 10 to 12) and XL (shoe size 13 to 15).