Perfect everyday activewear, available in the same  colour ways as the mens range.
Dad and lad are sure to look proud as punch in matching T-shirts.
Boys chest sizing:
Age 4-5 (XS) 63cm
Age 6-7 (S) 68cm 
Age 8-9 (M) 73cm
Age 9-10 (L) 78cm
Age 10-11 (XL) 83cm
Age 12-13 (XXL) 89cm