Youth's shoe size 2 to 6. One size fits most kids. inner:100% polyester, outer:98% acrylic,2% spandex The plush and inside base are super soft and nice on your feet, they keep your feet nice and warm. Non-skid bottoms keep you steady, and you can wear them on the go! Our stylish and fashionable slipper designs decorate your everyday life. Machine wash cold with no bleach and hang to dry.