[KIDS] XS (AGE 3/4), [KIDS] S (AGE 5/6), [KIDS] M (AGE 7/8), [KIDS] L (AGE 9/11), [KIDS] XL (AGE 12/13), [ADULTS] S (37" CHEST), [ADULTS] M (40" CHEST), [ADULTS] L (43" CHEST), [ADULTS] XL (45" CHEST), [ADULTS] XXL (48" CHEST)