[spaghetti]

Italian company C4, famous for its fine bifins, is now aggressing the market of monofins. A prototype has been recently unveiled at the "International scientific convention on apnea training".
Pics are hardly available on internet, but that thing is huge: the C4 Monofin is all made of carbon, with Mustang-Stile footpockets, side "T" shaped water rails and a big "Flap" (same as on the C4 Flap and Mustangs). It looks like two Mustangs put together.
This was just FYI