We have purchased different brands of tights for our son, for dance and active life. These tights are comfortable, the fabric is super fine and feel really soft. However, the waistband is spacious, not cramped, it is not stay up properly on waist and ride down. About sizing, normally he wears an adult medium, we bought size S, fit perfect. I think they are not for ballet lessons. Overall, they are good.
I bought these leggings to my daughter. When I opened the package the pants seemed short so I thought I had gotten some capris instead. However, when my daughter tried them on they fit perfectly to the ankle. She loves her leggings! She is 5'5" tall and the pants look very good on her.