Question about Arena Team Pro Solid

This item is a German size 40.

I still don't understand your size descriptions. Could you explain them to me? Why are there 2 digits?

Sizes listed for Arena swimwear, such as the Team Pro Solid, generally follow international sizing standards, including French and German sizes. However, to determine whether sizes 36 and 40 are specifically French or German, it is best to consult Arena's official size guide, which provides correspondences between international sizes and body measurements. French and German sizes may vary slightly between brands, but Arena often uses sizes that correspond to European standards.