These items were handmade by my grandmother as a hobby. They are made of yarn and are therefore stretchy, so they can be worn comfortably even by those with large feet. She can make them as a hobby if you request them. Single items are also available. The size is approximately 20 centimeters. Larger sizes are fine, but smaller sizes may make it difficult to walk. The proceeds will go to my grandmother, so please refrain from significant price reductions. I wear them when I sleep because my feet get cold, and they are very warm. The string in the center can be removed for use. It is tied up for storage and can be removed manually.