The padding makes this mask feel tight. If you are near a measurement, go to the next size up. Most people need a #2. #0 is for kids, very small. Wearing glasses is difficult with the mask becuase the foam is mostly around the front of the face.
. If you are getting the SPES Trinity Mask Cover
Size #1 and #1+ get a Large Trinity
Size #2, get an XL Trinity
Mask Weight Comparisons for Medium/#1 Sizes.
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)