Comfortable Foot Pockets Easily removable--even in the water! Dive-grade Neoprene Cover Virtually unbreakable polypropylene Insert comes with lifetime warranty Buoyancy Neutral Experience the propulsion and durability of our Fantasy Fin Monofin made for our smaller Fantasy Fin Mermaid Tails! You’ll swim safely and securely in our patented monofin designed with your comfort in mind. Glide through the water with more speed and less effort while sporting this stylish and unique monofin, or slip it inside one of our Fantasy Fin swimmable mermaid tails! Mermaid tails should not be used without the monofin worn inside the tail. The Fantasy Fin Monofin only fits Fantasy Fin style mermaid tails and is 17" x 14". Fantasy Fin tail skin is not available on Amazon, but it is at Fin Fun.