Thanks Trux...unfortunately I only use plastic Cressi fins, that partly explain my ignorance about this matter. Certainly records did not dipends on waterrails only (never thought such a thing!), but the continous evolutions about them must mean something. I don't believe C4 made those changes just for commercial reasons, every C4 product evolution never appeared banal.
Anyway thanks for the opinion, now I'm gonna see the video you suggested.
Bye
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