This is the replacement cushion for the ResMed Activa LT Nasal Interface and for ResMed's Mirage SOftGel. The interface comes with a cushion clip included. ActiveCell Technology. The cushion for the Activa and Mirage SoftGel features ResMed's patented ActiveCell technology. ActiveCell works to accommodate movement while you sleep, which helps to prevent leaks for restless patients. The bubble-like membrane surrounds the dual-wall cushion and expands and contracts to allow for different sleeping positions. The membrane in the new cushion is less cumbersome than the original model and prevents you from needing to overtighten your headgear to create a durable seal. Loose Fitting Cushion. The ActiveCell membrane will seal around your face comfortably without necessitating overtightening. This allows you to sleep comfortably by reducing pressure points and eliminating facial blemishes when you wake up. Key Features. Compatible with Two Different Interfaces. Comfortable Attachment. Features Patented ActiveCell Technology to Accommodate Active Sleepers. Reviewers Tip. This is intended as a replacement cushion: you won't need to purchase this separately if you're buying your original ResMed Activa LT Nasal Interface or the ResMed Mirage SoftGel Interface. ActiveCell Technology. cushion mask.