Measure from base of palm to tip of longest finger. XXS (00) Up to 5 ¼" XS (0) 5 ¼" - 5 ¾" Small (1) 5 ¾" - 6 ¼" Medium (2)6 ¼" - 7" Large (3) 7" and up ALL GRIPS ARE SOLD PER PAIR. Don't forget to purchase wristbands or wrist neoprene with your grip purchase.