This is a very ordinary mask sold everywhere. My dissatisfaction came when I placed an order and was offered this free mask. Did I want the mask? Well sure since it was free. Imagine my surprise when I see on the shipping invoice that I was charged 2.99 for the mask. Sneaky way to add 3 bucks to every order. Shame on you. I spent 70 dollars..got a free 3 dollar mask and to add insult to injury both humidifier bottles cracked within 24 hours leaking water all over my concentrator. So I am out 25 dollars for the bottles and 3 for the mask. You can bet your sweet you know what that I will never order from Oxygen Plus Medical. Order at your own risk. Hey guys...aren’t you glad you kept sending me emails for this review?