I'm selling these bibs now that my child has outgrown them. My child drooled a lot, so they were very useful. The back is made of waterproof fabric, and as you can see if you check the official website, they cost a little over 1000 yen each. They're secondhand, so there's some wear and tear from washing, but they're still usable. I wrote my child's name on the tags, so I've cut them all off. The mum2mum tag is coming off on one of them (photo 5 only).