It's Asian Size.
28 --------------- for weight 99.2lbs - 115lbs
29 --------------- for weight 115lbs - 126lbs
30 --------------- for weight 126lbs - 137lbs
31 --------------- for weight 137lbs - 148lbs
32 --------------- for weight 148lbs - 159lbs
33 --------------- for weight 159lbs - 170lbs
34 --------------- for weight 170lbs - 181lbs
35 --------------- for weight 181lbs - 192lbs
36 --------------- for weight 192lbs - 220lbs
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