How to measure
If you are in between measurements, it is always recommended to choose a size larger, as you can adjust the fit using the tightness using earloops and the provided head strap. If you get different results from (A) and (B), use of the size according to (A).Nose to chin (A)
Use a tape measure to measure from around 2.5 cm (1 inch) from the tip of your nose to 2.5cm (1 inch) under your chin
Nose to earlobe (B):
Use a tape measure to measure from the tip of your nose to your earlobe.