Chin Straps are designed to hold your chin comfortably and keep your mouth closed while you sleep. This lessens air leaking which will dry out your nasal and throat passages, and encourages breathing through your nose. A snug and secure design ensures that the patient's chin will be held in place while the patient sleeps. The adjustable chin strap is recommended for adults to help prevent some of the nasal and oral drying that can occur during CPAP and bi-level therapy. The Adjustable chin strap helps to prevent air flow leaking from your mouth by holding your chin in a stable position which encourages breathing through your nose.