100% Cotton Send him off to bed in super cute style with this Batman Pajama Set. FOUR PIECES: 2 Tops and 2 Bottoms. Each set includes 1 short sleeve top with matching shorts, and 1 long sleeve top with matching pull-on pants. VERSATILE: When temperatures are warmer, he can wear the tee and shorts and then switch out to the long pants and long sleeve shirt for extra warmth and coziness when the temperatures get cooler, while still sporting Batman. COMFORTABLE: Elastic waist on pants and shorts for comfort and easy on and off. Soft 100% cotton. NOT FLAME RESISTANT: For child’s safety, garment should fit snugly. This garment is not flame resistant. Loose-fitting garments are more likely to catch fire.