CPAP masks come in three main types: nasal masks, nasal pillow masks, and full face masks. Each delivers pressurized air differently, fits a different part of your face, and works best for specific breathing patterns and pressure settings. Choosing the right one has a real impact on comfort and whether you actually keep using your machine.
Nasal Pillow Masks
Nasal pillow masks are the smallest and lightest option. Two soft inserts sit just inside your nostrils, delivering air directly without covering your nose or face. Because the contact area is so small, the headgear needs less tension to hold everything in place, and your field of vision stays completely open. If you wear glasses to read or watch TV before falling asleep, nasal pillows won’t get in the way.
The minimal facial contact also makes nasal pillows a strong choice if larger masks make you feel claustrophobic, or if you’ve developed pressure sores on the bridge of your nose from a traditional nasal mask. A Cochrane review of CPAP interfaces found nasal pillows to be a useful alternative for people who can’t tolerate conventional nasal masks.
The main trade-off is at higher pressures. Nasal pillows have traditionally been reserved for lower pressure settings, with some concern about air leaks and nasal dryness as pressure climbs. However, research published in the Journal of Clinical Sleep Medicine found that nasal pillows performed as well as standard nasal masks even at pressures of 12 cmH₂O and above. If your prescribed pressure runs high, nasal pillows can still work, but you may need heated humidification to manage dryness and irritation in your nostrils. One study using auto-adjusting machines found that pillow-style masks roughly doubled the odds of higher average air leakage compared to nasal masks, so leak monitoring matters more with this style.
Nasal Masks
Nasal masks cover your entire nose with a cushioned seal that rests against the skin around it. They don’t touch your nostrils directly, which some people find more comfortable than pillow inserts, especially at higher pressures where concentrated airflow can irritate nasal passages.
In terms of pressure, nasal masks tend to need the lowest settings of any mask category. A study comparing all three mask types found that the median effective pressure for nasal masks was 10 cmH₂O, compared to 11 for nasal pillows and 12 for full face masks. That lower requirement means your machine doesn’t have to work as hard to keep your airway open, which can translate to a quieter, more comfortable night.
The downside is that nasal masks sit on the bridge of your nose, and that contact point can cause skin irritation over time. In rare cases, prolonged pressure on the nasal bridge has led to ulceration. Using a properly sized mask is the most important preventive step. Some people also place a thin cushioning barrier, like a silicone gel sheet or a hydrocolloid dressing, between the mask and the bridge of the nose to distribute pressure more evenly. If you breathe through your mouth at night, a nasal mask alone won’t work well because the air pressure escapes through your open mouth. Adding a chin strap or switching to a full face mask solves this.
Full Face Masks
Full face masks (also called oronasal masks) cover both your nose and mouth with a single cushioned seal. They’re the go-to choice if you breathe through your mouth during sleep or have chronic nasal congestion that makes nose-only breathing unreliable. Because air can reach your airway through either route, you don’t lose pressure when your mouth opens.
The trade-off is size. Full face masks are bulkier, require more headgear tension to maintain a seal, and can feel confining. They also require higher pressure settings to be effective. That same comparative study found a median pressure of 12 cmH₂O for full face masks versus 10 for nasal masks, likely because the larger internal volume and the possibility of mouth leak demand more air to maintain the therapeutic effect.
Full face masks are typically recommended after you’ve tried a nasal mask or nasal pillows first. The Mayo Clinic suggests trying a nasal option combined with heated humidification and a chin strap for at least a month before switching to a full face mask. But if nasal congestion or blockage is a persistent issue, starting with a full face mask is reasonable.
Hybrid Masks
Hybrid masks combine elements of two designs. The most common version pairs nasal pillow inserts with a lower mouth cushion, delivering air through both the nostrils and the mouth without covering the bridge of the nose. This gives you the mouth-breathing capability of a full face mask with less facial coverage and better visibility.
Hybrid masks work well if you breathe through your mouth but find full face masks too bulky. They’re also a practical option for people who wear eyeglasses, since nothing sits across the nose bridge or cheeks where frames would rest. They’re less widely available than the three main types, and not every machine supplier carries them, so you may need to specifically request one.
Matching a Mask to Your Pressure
Your prescribed pressure setting plays a bigger role in mask selection than most people realize. At lower pressures (under 10 cmH₂O), all three main mask types perform similarly and the choice comes down to comfort and breathing style. As pressure increases, the differences start to matter.
Higher pressures push harder against the mask, which means a larger mask surface area needs more headgear tension to stay sealed. Nasal pillows, with their tiny contact area, actually require less force to stay in place at any given pressure. But the concentrated airflow into the nostrils can cause dryness. Nasal masks balance seal stability with comfort across a wide pressure range. Full face masks handle the highest pressures but tend to leak more around the chin and cheeks if the fit isn’t precise.
Mean pressure, the severity of your sleep apnea, and the percentage of the night your machine spends at higher pressure levels are all independent risk factors for air leakage. If your machine’s data shows frequent large leaks, the mask type or size is often the first thing to reassess.
Getting the Right Size
Even the right mask type will fail if the size is wrong. Most manufacturers offer small, medium, and large cushions, and the sizing is based on the width and length of your nose or, for full face masks, the distance from the bridge of your nose to just below your lower lip.
For nasal masks, the key measurement is the width of your nose at its widest point, measured in a straight horizontal line. Use a rigid ruler rather than a flexible tape measure for accuracy. Many manufacturers include a printable sizing template you can hold against your face, but taking an actual measurement is more reliable. Your face shape also changes when you lie down, so a mask that feels snug while sitting upright may behave differently once you’re on your pillow. Testing the seal while lying in your usual sleep position gives you a more realistic picture.
When to Replace Mask Components
CPAP mask cushions degrade faster than you might expect. The silicone or gel softens and loses its shape with nightly use and regular washing, which leads to air leaks that worsen gradually enough that you may not notice. Medicare’s replacement schedule allows two new cushions per month for both nasal and full face masks, which reflects how quickly the material breaks down. Headgear, the straps that hold the mask to your head, is covered for replacement every six months.
You don’t necessarily need to replace parts on that exact schedule, but if you’re tightening your headgear more than usual or waking up with air blowing into your eyes, the cushion has likely lost its seal. Facial oils and cleaning products can accelerate cushion breakdown, so washing with mild soap and letting cushions air dry extends their usable life.
Protecting Your Skin
Skin irritation is the most common physical side effect of CPAP use, and it varies by mask type. Nasal masks concentrate pressure on the bridge of the nose, which has thin skin over bone and very little cushioning tissue. A review of nearly 1,000 cases of nasal trauma from CPAP delivery systems found it to be a frequent problem, though long-term consequences were rare.
Nasal pillows shift the pressure point to the nostrils and the upper lip area, avoiding the nasal bridge entirely. Full face masks distribute force across a wider area but can cause irritation along the cheeks and jawline. For any mask type, red marks that disappear within an hour of removing the mask are normal. Marks that persist, break the skin, or become painful signal that the mask is too tight, the wrong size, or the cushion needs replacing. Adding a thin silicone gel sheet or hydrocolloid dressing at the pressure point can reduce injury rates significantly, a strategy that has been studied most extensively in hospital settings but works for home CPAP users as well.