The Mirage Activa LT was designed for CPAP users who want a hassle-free mask that is easy to fit, comfortable, and provides a secure seal for restless sleepers. This design accommodates movement during sleep, which results in fewer mask leaks for restless sleepers. The bubble-like membrane surrounding the dual-wall cushion expands and contracts to varying pressures and allows for different sleeping positions during the night. The new ActiveCell membrane is less cumbersome than the original, but still prevents CPAP users from over-tightening the mask headgear to create a secure seal. A looser fitting mask reduces pressure points and prevents red marks.