Snugz Full-Face mask liners are not compatible with ResMed Mirage Quattro, the extra large Fisher and Paykel Forma, and the large Respironics ComfortGel. They are also not recommended for under the nose masks such as the Respironics Amara View or DreamWear and the ResMed F30, or total face masks such as the Respironics FitLife.
To place the Snugz full face mask liner on your mask cushion, first, slide your hand through the mask liner with the black line facing inward, touching your fingertips. Use fingers to spread the liner open.
Next, hook the upper outer edge of the mask liner over the top of your mask. The black line should be facing the mask.
Then stretch the mask liner to secure over the other rounded corners of the mask. Finally, achieve your desired mask coverage and comfort through minor tugging adjustments. For best results, ensure that Snugz are pulled inside the mask enough to cover all of the rubber mask cushion.