Supports your body from the crown of your head. This cap was developed to support the area above the shoulders. It's made of breathable mesh material on both sides (see photo ↑⑧). It's recommended to wear it during sleep, under a hat, or under a helmet. LL size is 58cm and is soft and stretchy, so it won't feel tight on your head. The Relive Tape is placed along the center of the head. There's a mark on the front for easy fitting. 【Sizes】 ★ Stretches well due to the rubber S ⇒ 46cm M ⇒ 50cm L ⇒ 54cm LL ⇒ 58cm It's also fine to use it with a Relive shirt. ★ Although it's new and unused, please understand that it has been in someone's possession before purchasing. Feel free to buy it if you'd like!!