The way they are designed makes them very ergonomically efficient. Normal swim fins cause you to "fight" the water on both forward and backward strokes. Force fins are designed such that after stroking forward with your feet you can easily pull your feet back. I am sure there is some physical laws involved but I ain't never had no physics training. I just know that I would never use anything but force fins in either my float tube or my pontoon.
Yep, I've been watching eBay for quite a while now. Does anyone have any experience with what size to get if I was not to get the adjustables. I have a size 12 shoe and I normally wear neoprene flats type booties. I was just wondering if the extra-large was big enough or too big?
I have a pair of adjustable's now that work great but I need an extra pair for newbies that I take out on the water.