Haven't used these yet, other than dry fit, but I bought them just in case my booties where too thin. They seemed to really snug things up! Probably too much for using with booties but perfect for barefoot. Just as described!

First two times I used these I really thought they were a neat idea but I honestly didn't know if they were worth the hassle. That's because I'm a ding-dong who doesn't know how to use them. DON'T put them on your fins and then try to slip your foot through. DO put it on your foot and up your ankle, then pull down onto your fin. There's a YouTube video out there that demonstrates nicely. If you use them correctly, they're easy and provide a good snug fit.

Much nicer quality than at the LDS. LDS did not have my size so very glad I thought to check Mako!

My fins are just a tad loose so these fin keepers give me that little bit of extra comfort that I’m not going to be one wheel drive when in the water

They did the trick every time.

This appears to be the same thin keeper that everyone else has not only is the Mako version cheaper they offer multiple sizes that most people do not. My wife and her little tiny feet she now I'm finally has been Keepers that's it we are very thankful for your products and services

Perfect, especially at the price

I use a size large. 9 1/2 foot, works for bare foot, 3mm booties, 5mm socks in 10-11 Mako Competition Freediver fins.

Seem to work fine. They help support keeping fins on your foot.