Best in Rest has designed this adjustable chin strap offering maximum comfort and an easy to use assembly. Gently cradle your chin preventing your mouth from opening as you sleep and causing air leaks to your CPAP mask. Air escaping as you sleep increases the potential of you receiving poor sleep and waking up feeling tired. By comfortably keeping your mouth closed with a chin strap, you are forced to breathe through your nose reducing snoring and maximizing the sleep therapy you receive from your CPAP machine!