Sweatpants are a casual variety of soft trousers intended for comfort or athletic purposes, although they are now worn in many different situations. In the United Kingdom, Ireland, Australia, New Zealand, and South Africa they are known as tracksuit bottoms. In Australia and New Zealand, they are also commonly known as track pants, trackies or tracky daks. Sweatpants are usually made from stretchy knitted jersey fabrics of differing weights, including single jersey, double jersey, fleeceback jersey, and loopback jersey (terry).http://www.ohsuregymwearoem.com/sweatshirt/