What fins means in practice
Fins provide propulsion. Full-foot and open-heel designs differ in how the foot is held, and footwear compatibility matters when choosing a system. Evaluate fins with the footwear and exposure protection intended for the trip.
An example to think through
A traveller orders fins using everyday shoe size, then plans to wear different boots at the destination. A better enquiry includes the actual boot model and asks the rental provider to confirm the combination during fitting.
A common misunderstanding
Matching size labels do not establish a comfortable fin-and-boot fit.
Underlying concept: PADI — Fins. The example is an original YouDive study prompt, not a reported dive.