The ResMed Cushion Clip is the part of the CPAP mask that connects the cushion to the frame. The cushion clip is inserted into the channel around the cushion and then snapped onto the mask frame. The Mirage Activa™ LT Cushion Clip fits the Mirage Activa™ LT Nasal Mask and the Mirage™ SoftGel Nasal Mask.