This is the replacement Gel Cushion and SST Flap for the ComfortGel and ComfortGel Blue Nasal Masks. The patented blue gel cushion provides both comfort and softness, while the SST flap creates the solid seal you're looking for.
The cushion and accompanying SST flap are available in sizes: petite, small, medium, and large. For a more custom fit, the gel cushion can be boiled so that the mask adapts to the curves of your face.
For more information on this process, see Philips' Guide to Customizing the ComfortGel Cushion
Where do I find the size?
The size of the gel cushion and the SST flap is located on the bottom of the gel cushion, where the mask frame and nasal cushion connect. If the mask is a size small, medium, or large, the letter indicating the size of the mask will be black. If the cushion is petite, a blue letter will indicated the size of the cushion.
If the user removes the gel cushion from the SST flap, the size will not be identifiable. The size of the gel cushion is not recorded, yet it directly corresponds to the size written on the silicone flap.System One Resistance Control