AirGel is really soft and comfortable. High quality for CPAP/BiPAP use. Just a lower grade headgear (included). Hospitals use for single patient and disposable purpose. Use Sleepnet EZ-Fit for high quality headgear replacement.</br>Super light weight?? Breathable headgear?? Quick release headgear?? 360 degree rotating elbow.</br>Flexible Space-bar holds the mask stability without touching the skin.</br>Active Headgear Connector moves as the patient moves for a reliable seal.</br>See www.sleepnetmasks.com for more information.</br></br>Product Description</br></br>Sleepnet masks are made in the USA with the latest technology?? which provides the most comfortable mask. Four sizes available: S?? M?? L?? XL. For a quick sizing guideline (no guarantee)?? the distance between the center of the eyes at the nasal bridge down to the concave part below the mouth should be around Small = 3.5" = 4.0"?? Large?? 4.5"Extra Large = 5.0". Please note that CPAP mask customer reviews are typically great or terrible because either the mask works or does not work. Since we all have unique faces?? it is a trial and error to find "he one" for each person. A mask that is terrible for someone could be the perfect mask for another person and vice versa.</br><br/>http://www.amazon.com/gp/product/B01G79U24GGg-free?? an