Made of 100% Polyester. Slip into silky-smooth sleepwear! These new jammie pants and button up shirts are "moosequerading" as luxurious silk. Pants feature a contrasting drawstring on elastic waistband and stylish ribbon trim. Button-up shirt features contrasting collar and trim on sleeves. Machine wash cold with like colors. Non-chlorine bleach when needed. Tumble dry low. Remove promptly. Warm iron as needed. Kids sizes run as follows: 6, 8, 10, 12.