The sides are flexible so can fit a child to just about any adult.
The mask fits most people/children and measures about 8" from string to string
3" from middle of the forhead - tip of nose
about 2" long ears... each are individually made so there may be SLIGHT variation.
When warmed with heat (hairdryer for instance) it becomes more fexiable to stretch to fit bigger faces and shrink to fit smaller faces.
Any questions feel free to ask...