Experience the propulsion and durability of our blue trim Monofin! 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 many swimmable mermaid tails! Mermaid tails should not be used without the monofin worn inside the tail. The Monofin Jr fits tail skin sizes 6-10 and the Monofin Pro fits tail skin sizes 12-Adult. Comfortable Foot Pockets Easily removable--even in the water! Dive-grade Neoprene Cover Virtually unbreakable polypropylene Insert comes with lifetime warranty Buoyancy Neutral