Take your measurement from under the eye bridge to under the chin as shown:

 

MODEL 1 (F) = 14 cm

MODEL 1 (M) = 15 cm

 

MODEL 2 (F) = 15 cm

MODEL 2 (M) = 16 cm

 

MODEL 3 (F) = 15.5 cm

MODEL 3 (M) = 18 cm

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