This is a helmet-type head guard for babies. I purchased it on Rakuten for about 2500 yen. Head circumference: Approximately 43cm to 53cm Target age: 8 months to 36 months Weight: 65g It's made of a lightweight material and is breathable. The size can be easily adjusted with Velcro. My child didn't wear it much, so it's in relatively good condition except for some pilling on the rubber part around the neck. Home cleaned. There are no instructions included, but I have a picture from when I sold another one previously (photo 4). It will be folded and shipped in a Yu-Packet dedicated box, but I also have the original box, so shipping in the box is also possible. In that case, the price will change, so please comment if you'd like that option.