Comfort is inherent in the design of the Twilight Mask. Created with extensive patient input, the Twilight Mask offers innovative features that have made it preferred by patients. Solid mask shell design with a silicone nasal cushion. Patent pending design uses headgear as forehead support to reduce irritation and allow for distribution of pressure across a larger surface. Headgear attaches to forehead adjustment and with clips to two points on the mask shell. Nasal cushions are available in 2 sizes: standard and large (Large cushion is deeper and can accommodate more height and width). Quiet 100% of patients tested rated this mask to be quieter than the mask they typically used. Clips prevent the mask from unintentionally disconnecting while patient is sleeping. Main swivel quietly rotates 360 degrees. Tubing swivel is made of acetal, which prevents squeaking when rotated. Includes mask shell, nasal cushion, 4 clips and headgear. 90 day limited warranty.