Eric Fattah bought over 20 mat mas fins many years ago in search of a monofin to match the one he used to set the record back then (no luck) and while there was a boggling array of stiffnesses and flex characteristics, the main thing I noticed was that the foot pockets were really uncomfortable for use more than a few minutes. They just had the wrong shape in my opinion. It would appear that they haven't changed the footpocket at all. I guess it works well for finswimmers.
In case you are wondering, Eric mostly bought the blades only and then we glued Finis footpockets onto them. Also tried Breier Brut (bad footpocket, too, too sloppy).
Pete
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