Here is the size chart for choosing your new diving fins. The size is primarily selected based on your regular shoe size (EU).
It's important that the fin fits securely on your foot without pinching. If it’s too loose, you risk getting blisters and reduced power transfer, meaning you'll exert more effort to swim. If it’s too tight, you might experience cramping in your foot.
The chart also includes information about the fin's total length (measurement A), which is useful to know if you plan to pack them in a suitcase for a trip.