These are Crocs kids' sandals made of mesh material for good breathability. The soles are also sturdy, so you can wear them with confidence in rivers, the sea, etc. The Velcro makes them easy to put on and take off, and you can secure them firmly to fit your feet. Size J3 (Japanese size 21cm). Fourth photo: Mitsukatsu (likely a name or brand) I am selling these because my child outgrew them without ever wearing them. - Brand: Crocs - Color: Blue/Yellow - Style: Sandals - Material: Mesh - Size: Kids' size - Design: Open toe Thank you for looking.