ComfortGel Blue was developed to create a mask that more patients would naturally embrace. That's why we combined the best of our time proven gel masks with new highly regarded enhancements that don't just create a new mask, they establish a whole new level of mask performance. Staying true to our acclaimed blue gel masks we've retained the globally popular comfort and flexibility features you expect, while enhancing patient comfort even further. With Respironics ComfortGel Blue, we've minimized pressure points, reduced noise, and redirected exhalation air flow away from the bed partner. These and other enhancements may help to create a better patient experience and encourage greater compliance. Philips Respironics System One Resistance Control and ComfortGel Blue work together to deliver optimum PAP therapy and comfort. ComfortGel Blue is latex free.