I am selling a mask used for treating sleep apnea. It is size M. This type covers not only the nose but also the mouth, making it ideal for those who tend to open their mouths during sleep. The cheek side has a hook design for easy removal and attachment. Please consider it. Please see the photos for the condition. You can use it immediately upon arrival. It is a used item, so please check the photos before purchasing. #FisherAndPaykel #fisherandpykel #CPAP #RESMED #PHILIPS #ResMed #Philips #SleepApnea