The goals are circumference goals. The goal "over shoulder" is measured from right below the chest at the front  - above the shoulder and to the same place on the back

SizeChestWaistOver Shoulder
JRS65-71 cm59-62 cm52-58 cm
JRM70-76 cm62-67 cm59-64 cm
JRL76-80 cm66-71 cm65-70 cm
JRXL80-86 cm71-76 cm70-76 cm
JRXXL86-90 cm80-85 cm76-84 cm