S (CM) M (CM) L (CM) XL (CM) 2XL (CM) PANTS (WAIST) 67 - 76 77 - 86 87 - 96 97 - 106 107 - 116 SHIRT (CHEST) 81 - 88 89 - 96 97 - 104 105 - 112 121 - 129 If your size normally is between two letter sizes (e.g. M and L) (adults), choose the smaller one. Still thinking what's the right size for you? Let us help!