These are convenient rain shoe covers for sudden rain or snow. You wear them over your shoes. They fold up thinly for easy carrying, making them convenient to quickly take out and use during sudden rain or localized downpours, which are becoming more common. They are also useful when traveling to snowy regions, as they won't add much to your luggage. The inside of the zipper is covered with nylon fabric, so rainwater won't get in, providing peace of mind. The shoe covers are 22cm high, reaching up to the ankle. They offer peace of mind even in shallow puddles. ●The length of the sole is 27cm. Please measure the length of the outside of your shoe's sole and choose a size that is about 1cm larger. (Actually, it's safer to choose more than 1cm larger. We recommend a slightly larger size.) For men's business shoes, it seems best to choose a size about 3cm larger than the actual shoe size. Please consider this after measuring the length of the outside of your shoe's sole. There is an adjustable elastic band on the instep of the shoe, so they fit snugly to your feet. In addition to rain protection, they are also appreciated by those who cannot wear regular shoes due to foot injuries or treatment.