There’s nothing weird or fancy about the overall design of the Mares Avanti Quattro Plus fins – they feature a traditional paddle-style blade that’s been used by dive fins for decades.
That said, where they do differ ever-so slightly is the incorporation of four channels (grooves or troughs) running vertically up from their tips.
These channels reduce drag and in doing so provide considerable extra thrusting power which is what makes them such powerful fins. You get a lot of propulsion from them with minimal kicking effort.
Stabilising tabs within each channel also mean that they’ll provide a smoother motion when you kick.
They’re constructed using hi-flex material so they won’t feel stiff or rigid when you’re using them which means minimal strain is exerted against the calf muscles.
The result is that you get more power with less effort and so won’t tire yourself out so much – ultimately this will mean your air consumption is less and you can dive for longer!