The ComfortGel Blue Nasal CPAP Mask with Headgear uses technology developed by Respironics. Improvements can be found over the earlier versions in the gel cushion and forehead pad design. A new angled elbow and exhalation micro ports reduce overall sound. Lastly, the cushion is now labeled with a System One Resistance Control rating. PR System One machines use this rating to identify and adjust pressures based on the mask used.