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Sizing CSA approved Masks:
For both the G1 and G2 fitting couldn't be easier. Simply measure the circumference of your head one half inch above your eyebrow. Cross reference your head measurement with the Chart below.  As an example, if your head measures 21.25" you would be best suited for a G2 Small. Another example would be if your head measures 22.5" you could fit in the G2 Medium or the G1 Medium. This is because the sizing structure between the two models overlap to allow for growth.
 
G1:
  
MediumHat Size 71/8 - 71/2  or
Head size 22" to 23.25"
LargeHat Size 73/8 - 73/4   or
Head size 22.75" to 24"
   
G2:   
SmallHat Size 61/8 - 7 1/8  or
Head size 21" to 22.25"
MediumHat Size 7     - 7 3/8  or
Head size 21.75" to 23"
 
Sizing Pro/Senior Masks:
We recommend custom fitting for our pro level masks. We can achieve a perfect fit by obtaining six measurements from various points on your head. We also request two pictures: one straight on and one profile. We then custom build your padding system from the measurements and pictures  you provided. It is important that you get accurate measurements to ensure a correct fit. The pictures help us to position the cage for optimum sight lines as well as give us an idea of the overall shape of your head.
Stock sizes are available for all pro masks as well. Refer to  the above size chart.
 
sizing image