28 - 30 inches (69 - 74 centimeters)YOU WILL NEED SIZE SMALL
31 - 34 inches (75 - 83 centimeters) YOU WILL NEED SIZE MEDIUM
35 - 38 inches (84 - 93 centimeters) YOU WILL NEED SIZE LARGE
39 - 42 inches (94 - 103 centimeters) YOU WILL NEED SIZE X-LARGE