A progressive release system with a pop out design will be a great way to reduce the chance of injury when sliding into this soft base. Constructed of molded rubber, the base includes a base mount for anchoring it in place. It is designed not to move or change positions when a player runs or pushes off. Includes 1 base . Molded one-piece bases designed specifically as a progressive release" base to reduce the chances of injury when sliding . Does not move or change position when player runs or pushes off . "Pops out" on the impact of short, hard slides . Easy to replace . Comes complete with Base Mount . Although this base is designed to reduce sliding injuries, it is not a substitute for using proper sliding techniques