The tag says "O," but it feels like a men's L size. These are game pants for volleyball. Please refer to the 4th and 5th photos for the size. There is a possibility that the size description is incorrect. Be sure to check the actual product in the photos. The simple design makes them easy to match, and they are also recommended for spares or team use. There may be other sizes and colors available, so please take a look at the list of items for sale. Keywords: Volleyball, game pants, volleyball pants, practice wear, match wear, uniform, club activities, men's, women's, junior, sportswear, simple, black pants Size...L