Made of 100% Cotton. This two piece flannel set is great for sleeping our lounging. Button down top has a left breast pocket and pink buttons. Pants have an elastic waistband with a drawstring. Both feature an allover Hello Kitty print. Machine wash cold. Turn inside out. Wash separately or with like colors. Gentle cycle. Only non-chlorine bleach when needed. Tumble dry low. Remove promptly. Cool iron if needed. Sizes run as follows: Sizes are as follows: Small (3-5), Medium (7), Large (9) and X-Large (11-13). This is the teen/adult line - the sizes run small, but this is not the kids line.