The Nuance & Nuance Pro Nasal Pillow CPAP Masks with Gel Nasal Pillows are the first of a kind in nasal pillow masks. By using the gel technology Philips Respironics pioneered in a lightweight and minimal nasal pillow design they offer a new dimension in comfort and seal. The gel nasal pillows fit two frame designs, offering a choice of a fabric or silicone frame. The Nuance Pro uses a clear silicone frame with gel pads to cushion the cheeks. The Nuance uses a soft cloth mask frame for lightweight comfort. Both come with all three sizes of gel nasal pillow. This is a nasal pillow CPAP mask and covers only the nares or nostrils, delivering air directly to the nasal cavity.