Our nylon lycra mermaid swim tails consist of a body hugging suit with a neoprene mono fin in the bottom. Second photo shows how the fin looks on the child's feet. However, the fin is enclosed in the tail and is not removable. If a child can not yet swim underwater confidently by themselves, then they are not ready to swim with a mermaid tail. Our mermaid tails are designed for experienced swimmers only. Adult supervision is required for every and all mermaid adventure. Remember that even through kids tend to pick up “mermaiding” very easily, an adult should always be nearby for safety.