In a unique twist to mask design the Wisp CPAP & BiPAP is available with two frame options: The clear, sleek, silicone frame is lightweight and flexible with smooth, fluid surfaces that conform to your facial contours and follow your every move. The soft, gray, fabric frame is reversible with two different fabrics so you can choose the cushioning that feels best to you. Soft fabric and sleek silicone frames are interchangeable so any frame can be used with any Wisp mask.