Operon is a polyurethane fiber that can expand and contract like rubber does. Undergarments made with Operon fit the body smoothly. Yet there is no sensation of pressure when wearing them. Nor do they leave the marks or restrict the body as rubber does.
  Operon, like rubber, incorporates the ability to expand and contract into the molecular structure of each thread. However, Operon threads are made from several extremely thin filaments, in contrast with rubber, and are therefore thinner than strands of rubber could ever be, making them far more suitable for use with clothing. In addition, Operon lasts much longer than rubber ever could.
  * Processed material * Rubber * Operon