This product uses Arnston, developed by Kuraray Plastics, instead of polyurethane, which deteriorates over time, and bonds it to a soft-to-the-touch textile. It stretches in a unique way, and although it is soft, it has a firm rebound. It is not yet a widely used material, though it does have a track record with major sports brands, but since it does not deteriorate over time, how about replacing waist elastic with it so it can be used for a long time?