The Headgear for AirFit F10 Full Face Mask is the replacement full face headgear. Select the desired size at the time of ordering.Both the AirFit F10 and the AirFit F10 For Her come packaged with a headgear labeled as size in.Standardin.. However, the two standard headgear are NOT the same size.AirFit F10 comes packaged with and Standard headgear featuring blue accents.AirFit F10 For Her comes packaged with Standard headgear featuring pink accents.The PINK size in.Standardin. headgear is the SAME SIZE as the BLUE size in.Smallin. headgear.The AirFit F10 headgear is designed with a curve to hug the back of the head and support the mask fit and seal and the headgear does not lay flat.See the Specs Tab of this product page for measurement information.