All DollyRocker face masks have a cotton outer layer, fusible non-woven lining and a cotton inner pocket should you wish to insert a filter of your choice (not provided).
Small - children 5 under
Medium - 6-12yrs
Large - 12yrs up Ladies and small men
Now for the disclaimer..... They are not medical grade in any way, shape or form.
Hot Wash after every use.