The mini is recommended if the back ear distance is less than 23.5cm. You can put a string at the back of the head from one ear to the other and then measure the distance. Shokz has a size guide on their product page: https://cdn.shopify.com/s/files/1/0474/1981/8141/files/Find_your_size_DE.pdf?v=1650011198

Many thanks for the information! The information has been passed on and will be adapted if necessary.

After using the Shokz Open Run Mini for the first time, I also bought the Open COM for my home office. For me, it is the perfect way to listen and also to hear the surroundings. I give it a clear recommendation to buy.