BLUE Gel Nasal Cushions and SST Comfort Flaps are supplied with all ComfortGel BLUE Nasal CPAP/BiPAP Masks. They are also compatible with ComfortGel "Original" NASAL CPAP/BiPAP Masks. The BLUE Gel Nasal Cushion features a new generation, soft, pliable gel that readily adapts to facial features, thereby simplifying fit and contributing to overall comfort. The Secure Seal Technology (SST) Comfort Flap fits over the gel cushion to improve overall seal and help extend the life of the cushion.