The Thera-Band Set Aqua Finnish be attached to the ankle and provide additional resistance to movement in the water. They come in sets.
The water can flow through the small holes of the wings of the Thera-Band Aqua Finnish. Lateral movements, a large part of the water is stopped by the wings, so that resistance is built up. The movements are weighted in this way. The Velcro on the inside of them can be held down to any size.