The ComfortGel Blue Full Face Cushion can be used for both the ComfortGel Blue Full Face Mask and the ComfortGel Full Face Mask. The sizing is on the bottom of the SST Flap not on the blue cushion. The cushions soft gel is made to give the user comfort while the SST flap will keep the seal throughout the night.

Features:

1. The cushion is made up of 2 separate parts, the blue gel cushion and the SST Flap.
2. The cushion will only fit the frame that has the same size.