The shoe cover is also equipped with special tread mechanism to prevent slipping of the sole. The shoe covers are made of non-toxic silicone rubber, waterproof shoe covers, snow, dustproof. Available in M, L size, please refer to the description and size chart picture for specific dimensions. New Design: The silicone shoe covers is compatible with rain boots that are waterproof and mud-proof, and is compatible with ordinary shoe covers that are small, lightweight, easy to wear. Easy to use and light-weighted to carry. Gets very compact when packed to be kept in shoe bags/pouches. Wear it within few seconds. Walk, run or ride in any weather conditions - 365 days. If you are wearing shoes in bad weather, your shoes are easy to open, break and stink, which will reduce the life of the shoes. At this time, you can easily put on the shoe cover, silicone shoe cover is an umbrella for your shoes. The silicone shoes cover is flexible and easy to put on and off. The waterproof shoes cover is small and easy to carry, just put it in your carry-on bag. The shoes cover is easy to clean, dirty, just wipe it with water and rinse it. Read Less