Carbon monofins are not that rare. They've been around for quite a long time for finswimming, at least ten years, I think, probably longer.
This design is unique in the fin set-up, by the looks of it, it really is similar to two bi fins fused together. I'm curious to know how the thickness goes from toe to tip and if they have done anything special with the flex characteristics a la Mat Mas or Russian fins.
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