beanojones
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A good thumbnail test for actual mask fit is to bite the knuckle of your index finger while trying on your mask.
I am not sure why retail staff don't have people do this since it pretty much eliminates fit problems. Most masks fit most people if they just do a suction test without a knuckle bite.
I am not sure why retail staff don't have people do this since it pretty much eliminates fit problems. Most masks fit most people if they just do a suction test without a knuckle bite.