This is from the brand Minimalight, purchased at the YAMAP store. I've only tried it on. I have a large head (about 60cm), but the size is just right. It's 100% polyester and quick-drying. It folds up easily to fit in a backpack. There are loops to attach a chin strap, but a chin strap was not included when I purchased it. I will include a separately purchased chin strap. I will fold it to fit in a Yu-packet size (230 yen) for shipping. Thank you.