(3 out of 5) by Deborah

"I find this mask to be very comfortable, especially since the bottom fits over my chin. I wear the small but there are 3 sizes included so you can choose your best fit. It does leak air but it may be my 18 setting on my C-Pap."

(4 out of 5) by Curtis

"fits good lasts about 4 to 6 months. Works well with a new liner and headgear after several months the the hook holding the headgear bends and is harder to keep the headgear hooked to the mask"

(5 out of 5) by James

"I have tried many masks - nasal pillows, hybrid and full face. I am a mouth breather so I need the full face function. I have been using the Zzz Mask by ProBasic and like it a lot (except for the quality of the headgear). I decided to try the HC431 again as I had used it brifly as a trial when I first started and found it to be quite comfortable, except that it left a red mark on the bridge of my nose and my nose became tender at that spot. This mask comes with three different inserts, small, mediam and large, so it is easy to try differnt sizes. The medium had the same effect as last time I used the mask, but I have been using the large for the past few days and it is better. There is some leakage, but I think all masks will leak a bit depending on how you sleep. The mask is sturdy, easy to clean and the head gear is good quality. I bought the insurance, so I will give it another couple of weeks, but so far it looks promising."