Made of 100% Cotton Poplin. Classic pajama set includes a cotton poplin eyemask… perfect for naptime or airplane travel! Shortsleeve button down shirt and elastic waistband/drawstring pants! NOT pre-shrunk. These pajamas WILL shrink when washed. Please try on before washing. The shrinkage is roughly 1" in the width and length. If you think they will not fit after washing, please return before washing. You can NOT return after washing. Machine wash cold. Tumble dry low. No bleach. Will shrink when washed. Sizes run as follows: XS (4), Sml (6-8), Med (10), Lrg (12-14), XL (16), 1X (18-20).