If you're part of a slow-pitch league, it's important to seek out slow-pitch softballs. Choose ASA softballs with strong covers and center cores to satisfy ASA standards. Slow-pitch softballs that prevent compression loss help with hitting the ball at great distances, and softballs with rigid cores extend the performance and life of the ball. Pick out softballs with raised seams to supply an enhanced grip for easy catching, throwing and pitching.