The Blue Silicone Flap and Gel Cushion Combo is one of the key secrets of the ComfortGel Blue Full Face Mask famous Comfortable fit. Get the Combo pack which includes the removable ComfortGel Blue removable flap, easy to clean and wash. The Respironics ComfortGel Blue Flap and Gel Cushion is the key full replacement package for your ComfortGel Blue mask. Buy the Respironcs ComfortGel Blue Combo with a Flap and the Cushion Now at a great price shipped quickly. This is a replacement Cushion and Flap part for the ComfortGel Blue Nasal Mask and therefore do not need a prescription.