The ComfortGel Blue Nasal CPAP Mask with Headgear from Respiroincs offers angled exhalation micro ports to help reducing overall airflow noise. This mask includes a rating for use with the System One Resistance Control. This is a nasal mask and covers only the nose to deliver air flow. As an added advantage, the ComfortGel nasal mask frame has not changed and the new ComfortGel Blue Nasal Cushions and Original Gel Nasal Cushions are interchangeable. Similar sizes in either style will work with similar frame sizes of either mask. Improved Gel Cushion Technology. The ComfortGel Blue continues to use a dual, gel cushion and silicone flap system. Respironics has improved the ComfortGel material. The gel is now softer and conforms to your face with greater ease. Use the separate silicone membrane that snaps on, over the gel cushion, to increase the life of the cushion and provides a unique Sure Seal Technology (SST), contouring a seal around the Gel Cushion. Premium Forehead Pad. The ComfortGel forehead pad is larger with more cushioning that is easy to fit and improves comfort. The forehead support comes with a StabilitySelector, which is adjustable and allows for movement. The pad attaches to a base that can swivel up or down; accommodating the angle of your forehead. Angled Exhalation Micro Ports. The new diffusion vent and 360 Degree elbow disperses air softer and quieter than before. Respironics has decreased the overall size of each port, allowing several micro ports to fit on the elbow. The elbow angles the ports away from your bed partner and the micro size diffuses airflow quietly, reducing overall sound. System One Resistance Control. Respironics wanted a machine to achieve optimal pressure no matter which mask is used. Resistance Control is the solution, a numbering system on all of Respironics CPAP masks based on variable resistance characteristics. Each number instructs the device to compensate for different mask types. The result? A consistent and reliable pressure enhanced with all the benefits of Flex Technology no matter which mask is used.