The Marvel Avengers Boys Size 6 Two Piece Pajamas feature a short sleeve crew neck pullover design in a vibrant multicolor. Made of polyester blended fabric, this pajama set is perfect for any season with its superhero theme from the Marvel Universe. The set includes a top and bottoms with a fun and stylish design that any young superhero fan would love to wear while sleeping. The pullover closure makes it easy to put on and take off, providing comfort and ease of movement for a good night's rest. I really don't see any flaws. This set does say it is not fire retardant.