Thank you for viewing! These are shin guards for children, designed with breathability to support comfortable play. They are unused, but I opened them for photography and measurement. I'm sorry, I don't know how to use them. Size: I believe they are for children, but the size isn't specified, so I'm not sure. Are there any previous users or anyone who can tell from this measurement? Please understand that these have been stored at home. Thank you. Leg guards, soccer, junior, children's shin guards, shin protectors. Injury prevention. k1-27