JOYCEOne: One Nasal mask in one size that fits nearly every face! Our current best-selling mask in international markets comes in just one size that provides a reliable, absolutely airtight fit for most patients. The good fit is made possible by the specially designed mask cushion and the new, highly flexible forehead support. The proven ball-and-socket joint makes sure the tube stays in place. Like our other masks, the JOYCEone very quietly releases the patient‘s exhaled air.