From Philips Respironics
Large ComfortGel Blue Full Face Mask with HeadgearA comfortable forehead cushion and enhanced StabilitySelector combine with our popular blue gel replaceable cushion to create a high level of comfort and stability. The unique sure seal technology (SST) provides a membrane-thin layer over the gel cushion to closely follow facial contours of both men and women, allowing more wearers to quickly achieve the comfortable seal they need.
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