http://www.simplyscuba.com/products/Scubapro/TwinJet.aspx
The Scubapro Twin Jet is a split fin with an adjustable foot and was inspired by the tail fin of a Humpback whale. The split fin provides more power per kick and less drag especially when you add in vents for water to be channeled through. An extra wide foot pockets allows comfort and means they are more suitable for wearing with a dry suit or semi dry suit.

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