An elastic band woven with rubber. The loop type makes it easy to put on and take off, just by putting it through your arm. The band size is adjustable without steps. Adjust the size by sliding the adjuster. The loop type is also nice because the extra belt doesn't stick out! ◎Color Ivory with a soft color. It is a color that is easy to use throughout the year, regardless of the season. I have only tried it on, so There are no scratches or stains, but please refrain from purchasing if you are nervous.