Quattro™ FX Full Face CPAP Mask with Headgear"Less Is More" with ResMed's Quattro FX Full Face CPAP Mask. The streamlined design is unobtrusive and covers less of the face. Experience better performance with a focus on compliance through comfort. The Quattro FX features fewer points of contact on the face, a flexible Spring Air cushion and frame, and a Swing Seal fitting technique for a quick and easy adjustment process. "Less Is More" with ResMed's Quattro FX Full Face CPAP Mask. The