Sea-tec chin straps

This Nasal CPAP chin strap is unique as it’s a multi-strap design secures it in place while supporting the chin and lips. The top and back straps are adjustable. The chin cup is larger for more support. The bottom lip is supported with the chin thanks to the stable multi-strap design. The materials are all elastic for greater comfort.
A chin strap addresses the problem of air leaks from your mouth while using nasal CPAP. It also prevents aerophagia (air swallowing) and related discomforts.
To know your size, measure around your head, and then from under your chin to the crown of your head up to just about the front of your ears then back to the starting point under your chin.