elmer fudd
Contributor
I also have to wonder to what extent those fish fins are actually split and how much of them are joined together by a translucent membrane.
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I know that some split fins work very well, but I really doubt that has anything to do with them being split up the middle. I think it has everything to do with them being floppy. The fins easily bend to 90 degrees and that allows them to push the diver ahead more directly.
But why are you swimming into current?