The ResMedQuattro™ FX headgear is designed to give you that extra softness and stability that is so important for a good fit. The Quattro™ FX headgear is designed to reach above the ears and over the crown of the head before connecting at the base of the head. With 4 headgear connection points, the 2 upper straps connect at the top of the mask frame, while the lower 2 straps connect to clips on the base of the CPAP mask frame. The Quattro™ FX replacement headgear strap is available in small, medium, and large sizes.