The shinfin leg fins are a great tool to teach you how to properly kick the flutter kick. Very beneficial for triathletes with stiff ankles and for beginner swimmers.

Here you can find more thorough shinfin review.

Step 1: How to Put on the Shinfin?

Note: the below instructions work only if the shinfin and straps are wet

The fin comes with one strap already placed in the hole, so keep it there and slip the fin on your leg, so the open slit where you will attach the other strap is on the inside of your foot. Take the second loose strap and insert it into the outside slit from the bottom and tighten the strap, so it is nice and snug on your leg. Then run it through the inside slit from the top and pull hard to make it go all the way through. Repeat for the other leg.

Step 2: How to Remove the Shinfin?

To take the shinfin leg fins off, just press the inside slit (where it is marked with an arrow) and pull very hard on the outside strap on the inner leg. The strap slides out and you are free to take the fin off your leg. It takes a few times to master it, but you can get it. Hint: don't be afraid to use some force, you won't break it :).