MATERIAL: Made of manganese steel and rubber, durable and cold-resistant, wear-resistance. LIGHTWEIGHT: Ultra lightweight design, portable, easy to fold. ANTI-SLIP: The bottom has spring teeth which is anti-slip, increasing friction with the road surface. SIZE: The shoe cover has very high flexibility, suitable for different sizes of shoes. WIDELY USE: Portable and simple crampon, suitable for outdoor mountaineering in ice and snow weather.