Super cute mermaid princess costume with wig and light-up headband, that will makes your little girl into princess herself | Our costume is made of soft polyester. Superior quality, durable and comfortable Size Small for kids 3-4T(95-110cm), Medium for kids 4-6 Years(110-120cm), Large for kids 7-9 Years(120-130cm) | Size Small for kids 3-4T(110-120cm), Medium for kids 4-6 Years(120-130cm), Large for kids 7-9 Years(130-140cm) | This lightweight dress is perfect for mermaid theme party, while on a cruise, amusement park, pageants, fancy party dress up, holiday cosplay, Halloween, Christmas and photo shooting, birthday parties, and whatever events you attend | Costume sizes are different from apparel and usually run smaller, be sure to refer to the size chart and if your child is at the top of a range consider purchasing a larger size