The ComfortGel Blue nasal mask covers just the nose with a soft blue gel cushion instead of the all-silicone seal you get on most nasal masks. The gel holds warmth and molds to your face, which is why we recommend it to people whose nose gets sore or red-marked from firmer cushions. A thin silicone Sure Seal Technology (SST) flap sits over the gel to lock in the seal, protect the gel from wear, and make the cushion easier to wipe clean. Unlike the original ComfortGel, this Blue version does not need to be boiled before first use. The gel is sealed inside the cushion casing, so you rinse it with mild soap and warm water and you are ready to go. An adjustable forehead pad on a StabilitySelector arm anchors the top of the seal; click it down a notch if you are getting leaks near your eyes. Cushions come in four sizes, Petite, Small, Medium, and Large, so you can dial in a precise fit rather than settling for a generic one. The four-point headgear uses EZPeel tabs for adjustment and Quick Clips for one-handed on/off, and the whole system is magnet-free, which matters if you or your partner has a pacemaker or another implanted device sensitive to magnetic clips. The built-in exhalation vent sits in the elbow, so you do not need a separate exhalation device, and it should never be blocked or covered. This mask covers the nose only. If you breathe through your mouth at night, pair it with a chin strap or look at a nasal pillow mask or a full face mask instead. This is a prescription device, so you will need a current CPAP or BiPAP prescription on file before we can ship it.