Eat your heart out, Ariel… Today was a great day at my house… the much anticipated arrival of Annie’s mermaid tail. Imagine being a child again… this would be a good day, indeed! Be Careful! This was not Annie’s first time swimming with the mermaid tail…she had a similar style last year that didn’t hold up very well, but she had a lot of practice swimming in one. It takes some time to get used to… We started with the monofin (the part you put your feet in) alone. When she was comfortable with that, we added the tail.