Monofin purchase - recommendations

[island_sands]

My fd buddy wants to invest in a mono fin... he has a very strong kick and is very fit.. don't know if this is something to consider.. but can i have some suggestions..
see the poll

Edit: will use for ocean and pool training - should they be different? He has never used one before.

 

[Merlin]

some more info may help like has he used one before? what is he planning to use it for recreational or performance? pool or ocean?

If he wants it for performance then I would recommend a Waterway (model 2 medium stiffness). But it may be really unconfortable for the ocean if he has to wear it for an extended period of time.