Fairy Tail Mermaids, Mermaid Tail Fin with Top for Swimming Monofin Fun Made in USA Swim with or without a monofin in our mermaid tail - MONOFIN IS INCLUDED Our tails are professionally sewn up the side to prevent seam from ripping! Pull up our tails and walk around - not possible with tails that come with a monofin already inserted - Important sizing information below Adult Supervision is a must if you plan to swim in your mermaid tail! Strong swimmers recommended! Monofin fits shoe sizes male 1-6, female 2-7. The Mermaid Fin should only be used under adult supervision.