Size: Please refer to our "Size Chart" to compare your child's size before purchasing. Material: High quality polyester lycra (88% polyester+12% spandex), more soft, comfortable, stretchy, and very breathable. Package includes: 1 * Fabric Mermaid Cover + 1 * Top + 1 * Bottom. (Excludes the "single fin" used to maintain the shape of the fin section; but most mermaid fins on the market (less than 19.5 inches wide) will fit perfectly.) Notes: 1: Hand wash with cold water and dry. 2: Please protect the mermaid cover and minimize friction with sharp ground (the cover cloth may be damaged) to prolong the life of the fabric. BEST GIFT (for 4-13 years old): Every girl has a mermaid princess dream, this is the best birthday gift for little girls and toddler girls who have mermaid dreams, make your mermaid dreams come true Play in the summer and enjoy the outdoors, perfect for mermaid party supplies, beach vacations, pool parties, cosplay, photos, hawaii and more.