You're Everything - Kate Alexa

There are three different types of mermaid tails used on the show: custom-fitted tails that the girls swim in, a "floppy tail" used for stationary shots, and a "hard tail" for stunts. The custom costumes took six months to build, with the tails and tops made from body casts and comprising individually hand-crafted scales. The finished product weighs between 12 and 15 kilograms (26 and 33 lb). Inside the tail are leg straps where the girls are strapped up and then zipped up. Once in costume, the girls have to be lifted into the water. Attempts were made to minimise the on-screen visibility of the zips on the tails, such as adding extra scales and crafting a ridge of material around the length of the zip. The tail fin itself was designed with a foot pedal to assist the actresses with swimming. This, along with the fin, adds some 60 centimetres (2 ft) to the length of the costume.