Mermaid Swim Tail by Shimmertail - Includes Fin! Shimmertail costumes are swimmable mermaid costumes with swim fin and foot straps INCLUDED! Shimmertail mermaid costumes are made with high quality swimsuit material. They include a fin with foot straps and are perfect for swimming! They can be used on land, as a costume, or in the pool! Please go to Shimmertail Mermaid Swimwear on Facebook to see how to put on the tail, remove the fin for washing and how to swim in it. https://www.facebook.com/shimmertail REMOVE the fin for walking, but slide it on for fantastic swimming! Put it on right next to the pool to avoid scratching the costume on the hard ground.