I've been using this buoy several times a week for three years now.
It took a little getting used to at first, but after a day or two I've loved it ever since. I feel it has improved my stroke and will not be going back to the old style of buoy.
I've been diligent to rinse it in cold water after each use but after all this time the glue at the seam is failing. The two pieces are splitting apart. I've been researching adhesives to use on EVA foam and have found a few options. The best is Barge's contact cement which cost $30 (same price as a new ankle buoy). Two other options are Gorilla Glue at $9 and DAP Weldwood contact cement at $9 also. I'm going to go with the DAP Weldwood and see how it works.
Other than this issue, this is a really fantastic piece of gear. Plus, its cheerful yellow color makes me happy when I see it.

Love the numerous ways these can be worn for various needs and resistance. However... we had to re-glue every buoy we bought for our high school team during the first season.. Use an adhesive remover, clean, and resprayed with 3M 90. has lasted two seasons since with no issues now.

The previous design of this product was a five star piece of training gear in that it was a dual purpose product; there was a contour between the ankle holes so that it could be used securely between the thighs. After a few years of use it came unglued and being concerned about repairing with adhesives not suitable for safe public pool water i decided to just order a new one. The product was redesigned and is smaller, stiffer, less ergonomic, and no longer dual purpose. Please bring back the previous design. It was the best pull buoy for thin swimmers who have thigh-gap and the widest thigh pull buoy available!

This buoy is perfect for eliminating leg drag and allowing me to focus on my arm strokes. The buoy feels much faster than a typical pull because the float keeps my legs close to surface. Once you try this you will never go back to the old school thigh buoy.

The FINIS Ankle Buoy completely changed the way I train body alignment and core control. By keeping my legs locked together, it eliminates any kick and forces me to engage my core and focus on upper body propulsion. It’s lightweight, stays in place, and gives immediate feedback on balance in the water. A must-have for serious swimmers looking to refine technique and build strength where it counts.