Comfortgel blue was designed to take full advantage of the philips respironics system one resistance control. Working together, the device recognizes when adjustments in therapy are required and carries out these adjustments. Premium forehead pad improves comfort Premium blue gel forms effective seal Minimized pressure points Two 360 degree swivels allow your tubing to move freely. Premium 4 point headgear with ez peel tabs makes adjustments easy for a custom fit.