Here's How:
Fold the strap over the front of the mask so that it is out of the way.
Hold the mask against your face.
Make sure it fits comfortably around your eyes and nose.
Choose another size if necessary.
While the mask is against your face, inhale through your nose.
The vacuum created in the mask should hold it against your face when you take your hand away.
If the mask doesn't stay put, repeat the process until you find one that does.
Tips:
Don't settle for an ill-fitting mask.
If you find more than one mask that fits, compare the features before making your purchase decision.
