This is an inner hat to be worn under a bicycle helmet. It has a sunshade that covers the back of the neck, making it great for sun protection. Size: 48-52cm It's a 2-WAY type that can also be used as a hat on its own. Purchased from Nishimatsuya. It's lighter, thinner, and made of softer fabric than a nursery school hat. It's smooth and doesn't feel bulky, so I think it's easy to wear inside a helmet. Only tried on, never used outside. The condition is good, but please understand that it has been stored at home. It will be folded compactly for shipping. Instant purchase is OK. I also have other children's items for sale ☺️ Please take a look from #yamariii_kids ♪ Bulk purchases are also welcome! #yamariii_kids