Rash Guards:
Youth Small = 5 to 7 years old
Youth Medium = 7 to 9 years old
Youth Large = 10 to 11 years old
X-Small = 90 to 125lbs
Small = 120 to 145lbs
Medium = 135 to 165lbs
Large = 160 to 190lbs
X-Large = 190 to 225lbs
XX-Large = 225 to 245lbs
Shorts:
Youth Small = 5 to 7 years old
Youth Medium = 7 to 9 years old
Youth Large = 10 to 11 years old
X-Small fits 27-28" waist, outseam 15", inseam, 4.35"
Small fits 28-31" waist, outseam 15.5", inseam, 4.5"
Medium fits 31-33" waist, outseam 16", inseam 4.75"
Large fits 33-37" waist, outseam 16.5", inseam 4.75"
X-Large fits 36-39" waist, outseam 17.5", inseam 4.75"
XX-Large fits 39-42" waist, outseam 18", inseam 4.75"
XXX-Large fits 41-44" waist, outseam 18.5, inseam 5"