Made of 100% Polyester Fleece. You'll love this all-fleece cozy lounge set that inlcudes matching slippers! Longsleeve v-neck shirt, elastic waistband pants, and footie slippers all have Hello Kitty graphics on them. Slippers have a non-skid sole. 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.