GreenSet is a supplier of acrylic hardcourt surfaces used in many professional tennis events run by the International Tennis Federation (ITF) and on the Association of Tennis Professionals (ATP) and Women's Tennis Association (WTA) tours. It is made of layers of acrylic resin and silica on top of an asphalt or concrete base, for permanent facilities, or on top of a wooden platform, for venues with occasional use. The company is based in Barcelona, Spain.