This is the headgear strap for the hybrid style Mirage Liberty™full face CPAP mask by ResMed. A hybrid mask style uses the nasal pillow cushion insert for a nasal seal while using a mouth cushion for a full face seal. This mask is typically prescribed for people that are on higher CPAP pressures or need to be able to breathe through the nose and the mouth. The upper headgear clips for this mask are included however, the lower headgear clips are NOT. Available in small and standard sizes.