This is a replacement push sole designed for the KR Strikeforce and hammer bowling performance bowling shoes.&Nbsp; these are designed specifically for left hand bowlers and their left push away foot. No trimming necessary as these come in sizes Made for your shoes. Simply select the correct size in the drop down menu. Petite W 6.5-7.5 small Medium 8/ W 7.5-9.5 Medium Medium 10/11.5 large Medium 12-13