I use the fins for serious pool (laps) & ocean swimming. The fins are small & light, & feel like a natural extention of ones feet. W' little effort, they greatly improve a weak  free style kick . Many adult swimmers w' no competetive swimming training tend to have a weak kick,which drops the legs,which creates drag & throws off the whole stroke.Because they are small & light  they are great for travel & good for recreational snorkeling.Y need to list shoe sizes (men lg 10-11).

I got these to help correct my stroke and for general training but there is a problem, they are too bouyant.  I struggle to get my feet under water when doing freestyle a problem I have never had.
I trimmed the inside of the fins near my ankle about 1/4 inch by 3" and drilled a 1/4 " hole in the top of the fin to alleviate the problem.  I still need to drill more holes and trim a bit more.  If this does not help I will be screwing a heavy nut and bolt into the holes I drilled to make the fins float less when freestyle kicking.  They are fine for backstroke and  ok for side swimming.
I would not recommend these fins.

Very comfortable, light.  Cut my time dramatically.  Much more comfortable than other fins I've used.

I feel not so confortable so I don t use more than 3 times a week.
The flotability of this kind of fins and the shape give them a natural movement  of the legs. I use regulary the Z2 but this new fins are quite good for change of power and mobility, even there are not so confortable. I use a little of vaseline to fit better.
Good for alternative fins but not for a regular training ... in my opinion.

These are so light and comfy.  My old fins were really rubbing my feet - had a flashback to the old days of trying to get sweat socks on while hanging on to a lane line.  These took to my feet within a 50, and I didn't even readjust once.  They are a little funky to kick with at first, and feet placement on flipturns had to be figured out.  However, at the end of the first workout, I could feel it in my calves but not my feet.  These are definitely worth a try if you have sensitive/difficult feet.

need to use vasoline on toes to prevent  blisters.  My feet are wide so need vasoline around inside edge to get them on .  gives a good workout for the legs