Carter's Baby Boy Christmas 2-Piece Cotton & Fleece PJs Includes long-sleeve snug-fitting cotton top and loose fit polyester microfleece pants No-pinch elastic waistband Snug-fitting cotton top is not flame-resistant. For child's safety, cotton top should fit snugly. Loose-fitting polyester microfleece bottom is flame-resistant Top: 100% cotton rib, bottom: 100% polyester microfleece Machine washable