Stark - or Iron Man as you may know him - is all about inventing for the future and the future of your comfort incudes these Mens Stark Expo Sleep Pants! The Marvel Iron Man Mens Sweatpants are a pair of all black sweatpants made of a cotton and polyester blend that is super comfortable and durable. The Stark Expo Mens Apparel features a bright bold soft hand print graphic on the upper left leg that reads Stark Expo - Changing the World for a Better Future.