i disagree on the diving fin theory. i have Cressi Dive fins and they are pretty long and super stiff. you dont need boots which is much nicer. i got them for 25 bucks. they work fine and just like any fin they make u tired after a long day. what i suggest is buying them and using them in a pool or somehting and if u dont like them return them. thats what i did. they cant tell. i did this with three pairs one pair i even used at the lake.