Designed to accommodate every patient and ensure a comfortable, hassle-free night, the Mirage Activa™ LT nasal mask is the only mask you'll ever need. With improved Active Cell technology from ResMed, the Mirage Activa LT's cushion expands and contracts to accommodate movement and therapy pressure changes throughout the night. The result: a mask that creates a gentle, secure seal and a dynamic defense against leak, and is easy to use for clinicians and patients alike.