So the flex of the blade seemed to be I would say a medium flex not huge but it does give on the up stroke. The interesting thing was there is a very good down curve on the fin which leads to a good down thrust and very little bend on the down stroke. This I feel gives you a lot of power if you need it. Maybe not so much speed but good power for quick moves. The other thing I noticed was that they were light weight much lighter then my current fins. And this can only mean less effort to work you fins in the water.
What I did not know was that these fins float and so to check this claim I simply tossed them in the water near shore. Yes they float which is great even though I don't feel you can lose these as the strap holds them very well to your foot. But is anything should happen you will not lose your fins they will float right next to you LOL. I think this are a very good pair of fins and in time my muscle memory will take over and the fins will win out over my old dive fins.