Comments about Force Fin Force-Fin Adjustable "Slim Fin":
For well over a year I have used these fins exclusively for lap swimming where I do 70 laps in a session (1 mile) several times a week. I have used other types of fins that provide good propulsion, but at the expense of foot irritations from rubbing and cutting---I do not like to use divers' socks.
The adjustable "Force Fin" provides a perfect and comfortable fit from the getgo and after swimming a mile there is no foot discomfort at all----at last.
These fins provide good propulsion and better exercise, but you'll find that after using these fins it is very difficult to go back to swimming with bare feet----it takes too long!