The Philips Respironics Nuance is a nasal pillow CPAP mask that is available in two styles of mask frame to provide users with a custom fit.. The Nuance Pro uses a soft fabric frame and the Nuance Gel uses a silicone gel frame. Just as important, the unique gel pillow nasal cushions of the Nuance Pro offer a high level of comfort while providing a perfect seal around the nostril preventing a mask leak. This interface style is light weight and one of the least invasive kinds of CPAP mask with headgear on the market.