Each adorable set includes three pieces – bathing suit top, bottom and most importantly – the Mermaid Tail. Your little mermaid can have her choice of Rainbow Design, Colorful Mermaid Skin/Scales Design, or Blue/Green Ombre (just like the sea). Sizes: XS=3-4T | S=4-5 Year | M= 6-7 Year | L=8-9 Year | XL=10-11 Year.