I've used CPAP for almost 20 years and have continually had problems with mouth leaks. I've tried several chin straps and all of them either slide out of position at night or uncomfortably pull my jaw back. I've also tried mouth taping which just gets wet and comes loose at night. I finally settled on using a soft cervical collar. While it controlled mouth leaks it was not very comfortable. When I saw the Knightsbridge Dual Band chin strap, I gave it a try. It works much better than any chin strap I've tried and comfortably holds my mouth closed. It controls leaks nearly as well as a collar and it is a lot more comfortable.