I've only tried on the gray one. It didn't suit my son, so I hope someone else can use it. The size is XL (9-12 years old), but based on the measurements, I think it's recommended for around 17-21cm. White thread is sewn into the yellow ribbing, but that's how it originally is. (Photo 5) I will fold it up small for shipping. Yuyu (Japan Post) may be switched to Rakuraku (Yamato Transport) or vice versa. It's new and unused, but it's been stored at home. Thank you for your understanding.