Fin Fun is the #1 worldwide brand of swimmable mermaid tails for children and adults. Our mermaid tail sets feature our patented monofin, designed for safety and comfort, as well as patented tail tip reinforcement technolog that makes our tails more durable and long lasting. In addition to a variety of tail designs and price points, we also offer coordinating swimwear, mermaid apparel, and beach accessories, as well, Swimwear, Dolls, Plush Toys, Blankets ...