These masks are one size and are made to fit an average head, there is a possibility that the elastics will fall either large or small.
If you are uncertain about your mask size, you can either:
1) Choose the cotton ribbon head support where you can fix yourself how tight your mask will be.
2) Measure your perfect size mask and compare it to the measurements below:
Mask length: 9*5 inches approx.
Elastic length: 5.5 inches approx.
Cotton ribbon length: 12.5 inches approx.
If the elastic bands are loose, you can either mend them yourself if you are comfortable with sewing or tie a knot.
Due to sanitary reasons returns are not possible but please feel free to contact me to any concerns you might have.