These are for shoe outer sizes of 23-26cm. I bought them for boots, but the outer size of my boots was larger than 26cm, so I'm offering them to someone who can use them. They are convenient to carry during the winter when roads suddenly freeze or snow accumulates. The 10 spikes provide a firm grip on snowy roads and icy surfaces. They are made of TPE plastic that stretches and contracts down to -40 degrees.