Marvel Big Boys' Avengers Set of Two Cotton Pajamas 100% Cotton Two-pack set that comes with two different pairs of Marvel Avengers prints Two-piece pajamas, with long sleeved top and pajama pant bottoms 100% cotton knit fabric that is intended to fit snug waistband has an elastic waistband, and the sleeves and legs are trimmed with a knit cuff Fabric is machine washable and comfortable to wear