1: The waist band is elastic and it's easy on and off, and can fit a variery of shapes and size. Satin covered waistband for added comfort. 2: Layered ballet tutu with led lights, made of high quality materials, with vibrant colors, soft and comfortable to wear. 3: The lights looks bright and awesome at night, and gives a great Illumination of the neon skirts. 4: Two button cells included. The battery is with ON/OFF switch in a small plastic box at the waistband. The led lights last long. 5: Eye-catching butterfly tutu skirt that won't easily fall off ,Great for costume parties, holiday events, marathon runs, and more. 6: Wings have sturdy frame and with soft elastic straps Specification for skirt Tile Waist:38cm(can strech to 70cm) .Skirt Length:About 28cm .One size fits for 2-6 years old children. Powered by 2 x button batteries (included and replacement) . Light mode: Burn on . Each skirt has 12 butterfly on it. 3-layers skirt. Note:If the weight of 7-8 years girl is fatter, the skirt may be smaller. Suitable for normal 2-8 body weight. please check the waistline