This wide, under-the-chin design is often favored by patients due to its ability to keep the mouth closed without digging into the skin. Pressure is distributed over a larger area with this comfortable and easy-to-wear chin strap. The adjustable design also makes it easy to size for almost all CPAP users. Chin straps are often used for those patients who experience problems associated with mouth-breathing during their CPAP therapy. A chin strap can solve these problems by holding the mouth closed during sleep, and may prevent the patient from having to wear a full face CPAP mask.