Measure the thickest part of your thigh ( around your thigh at the thickest part) using a cloth tape measure. Be sure to take this measurement with your jeans ON. Compare the size chart given below and go up 1 size or 2 size to make the chaps fit more comfortably.
2XS - 21 inch thigh XS - 22 inch thigh Small - 23 inch thigh Medium - 24 inch thigh Large - 25 inch thigh XL - 26 inch thigh 2XL - 27 inch thigh 3XL - 28 inch thigh 4XL - 29 inch thigh 5XL - 30 inch thigh