4-Piece Dinosaur Short Sleeve PJs; Includes 2 Tops and 2 Pants Ribbed cuffs & neckline; Covered elastic waistband for a comfy fit Heather Set: 60% cotton, 40% polyester; Red Set: 100% cotton Machine wash Crafted in soft cotton, this PJ set has your little one ready for bed in no time. Carter's cotton PJs are not flame resistant. But don't worry! They're designed with a snug and stretchy fit for safety and comfort.