These are officially licensed DC Comic Superman pajama pants! Superman is one of the founding members of the superhero team, The Justice Leauge and known for being faster than a speeding bullet, more powerful than a locomotive, and The Man of Steel. If you're a fan of DC Comics or Superman in general, you'll love these high-quality pajama pants! They feature a detailed all-over pattern of Superman in his classic superhero costume and Superman "S" logos and name script designs. They are made of 100% polyester. For questions regarding sizing, please refer to size chart.