It is a 10 teeth mountaineering slip shoe cover. This cover is used for sport shoes, hiking & high altitude boots. It is suitable for ice surfaces, grass and wet pavement, like skiing. The nails make sure you're safe when walking on ice, snow, grass, mud and sand. The silicone has high friction. It prevents you from falls. Different size you can choose, such as L, M, S and so on. It comes with various beautiful colors and your logos are welcome. Shoes in the picture are not included. 8.5" L x 5.2" W