Allcast Waterproof Duck Boot M These are Crocs work boots. The lower part is made of Crocs material. The upper part is synthetic leather. They are very light. They are waterproof, so they can also be used as snow boots. The size is US7, which I think is about 24 cm. I bought these a while ago. I wore them about 6 times at the time. They are clean, but the stitching is slightly frayed in a few places. There is a box, but it is crushed and dirty. Please understand that these are used items.