Diving boots with breathable mesh material and non-slip soles. - Color: Navy - Size: M - Sole Design: Non-slip - Material: Mesh and synthetic fiber Purchased last year and used a few times. My child's size 22cm feet fit perfectly, but this year, size 23cm was too tight. I think the size is around 21-22cm. I don't remember exactly where I bought them, but I think it was at Cainz. Thank you for looking.