The ResMed Mirage Activa LT CPAP mask and headgear is designed to accommodate every CPAP or BiPAP user and ensure a comfortable, hassle-free night. The ResMed Mirage Activa LT is an updated version of the extremely popular ResMed Mirage Activa Nasal mask. The Mirage Activa LT uses the proven ResMed ActiveCell technology and bellows-style nasal cushion to ensure minimal leaks and minimal facial pressure, even at high settings. With a slimmer profile and improved exhalation diffusing system, the ResMed Mirage Activa LT CPAP mask and headgear is one of our most popular nasal CPAP masks.