Seals mask comfortably without over tightening...

MaskMate seal and lubricant

See us featured at:

https://www.rtsleepworld.com/content/new-maskmate-helps-solve-mask-seal-and-irritation-problems

See #6 regarding typical mask issues:

http://www.mayoclinic.org/diseases-conditions/sleep-apnea/in-depth/cpap/art-20044164 - 40k