Small fits 4'11"-5'3" 100-125 lbs. Medium fits 5'3"-5'7" 125-150 lbs. Large fits 5'7"-5'11" 150-175 lbs. lbs.
Approximate measurements are:
S: length is about 60", across at armpits when laying flat is 18", across at waist 17" and across at hips 21"
M: length is about 61", across at armpits when laying flat is 19", across at waist 18" and across at hips 22"
L: length is about 62", across at armpits when laying flat is 21", across at waist 20" and across at hips 24"