These pajamas will feel luxurious on your skin! This fabric is high quality and very soft and comfortable. Made of 100% Polyester, classic Button up pajama features a button up lounger top with pocket and pants include an elastic waist band. Wash cold with like colors, dry on low heat only. Sizing Runs as follows: Small (chest 34-36"/ waist 29-31"), Medium (chest 38-40" / waist 32-34"). Large (chest 40-42" / waist 36-38"), XL (chest 44-46" / waist 38-40").