Folding fins

I spotted this sci-fi-looking fin at the DEMA show. As can be seen in the photo, the fin can be folded so that it does not take up much space in one’s luggage.

The foot pocket also fits all shoe sizes, since the size of the pocket can be adjusted or tightened, using straps that are inserted into the sole where they are attached with clips—this is nicely illustrated on the Polish manufacturer’s website.