Mermaid tails for swimming! The girls will love this!!
Jellyfish Dream Mermaid Tail For Kids With Monofin For Swimming #Mertailor
Make a swimmable mermaid tail in three easy steps. You'll need pattern paper, swim fabric and elastic, and a monofin.
Mermaid Tail for Swimming with Patented Fin Fun Monofin: Clothing
leads to a site which sells mermaid tails.