The Powerline fastpitch softball pitching mat is the ultimate training tool for athletes learning fastpitch softball pitching. The mat is designed to withstand extremely heavy training schedules and can be used indoors or outdoors. The softer pitching surface protects leg muscles & joints from continuous stress.The Club K Powerline features a unique triple guideline system. The two outside lines insure compliance with NCAA rule 2.19. The center line is the actual "power line" or line of force which indicates optimal foot placement and balance during the pitching motion.