All measurments are in inches. Boys (4-11 YRS) Size HEIGHT CHEST WAIST INSEAM AGE XS 5 44 23 22.5 19 4-5 S 6 47 24 23 20.5 5-6 7 49 25.5 23.5 23 6-7 M 8 52 26.5 24 25 7-8 L 10 55.5 27.5 25 27 8-9 12 58.5 28.5 26.5 28 9-10 XL 14 61.5 30.5 28 29 10-11 All measurments are in inches. Girls (4-11 YRS) Size HEIGHT CHEST WAIST INSEAM AGE XS 5 44 23 22 19 4-5 S 6 47 24 22.5 20.5 5-6 7 49 26 23 23 6-7 M 8 52 27 24 25 7-8 L 10 55 28.5 25 27 8-9 12 58 30 26 28.5 9-10 XL 14 61 31.5 28 30 10-11