We've put together a quick breakdown of tips for fitting your PAP mask properly:
Full-Face Masks — Mask users with forehead pads/brace: Tighten the upper strap first, then follow with lower strap positioning and fit.
Mask Headgear — Many masks come with “one-size-fits-most” headgear. Larger and smaller headgear may be available by special order.
Nasal Pillow Masks — Place the mask on your face and position the headgear. Place the side straps above the ears. Gently slip the nasal pillows into your nostrils, rotating the angle of the pillow barrel for a comfortable fit. The pillows should sit just inside the nostril opening and shouldn't be aggressively inserted. Proper placement should not cause the tip of the nose to be raised.