Adult Sizes run as follows:
X-Small - Fits anyone from 4'6 to 5' 85 lbs - 110 lbs
Small - Fits anyone from 5' to 5'5 110 lbs-140 lbs
Medium - Fits anyone from 5'6 to 5'10 140 lbs-180 lbs
Large - Fits anyone from 5'11 to 6'5 180 lbs- 220 lbs
X-Large - Fits anyone from 6'4 to 6'7 220 lbs- 260 lbs.