Measure your head using a soft tape measure. Lay the tape measure
underneath your chin, up one side of the head at the ear, over the top
of the head, down the other side of the head at the ear, and ending back
at your chin. Keep the tape measure fairly firm for an accurate
measure.

Mask Weight Comparisons
Wukusi Mask, Large:
Wukusi Mask, Medium: 4.6lbs (2.1 kg)
PBT #1 = 3.2lbs (1.45kg)
PBT #1 Warrior = 4.2lbs. (1.9kg)
AF Basic Medium = 2.6 lbs. (1.18kg)
AF Deluxe Medium = 4.4 lbs. (2 kg)