The Amara™ Headgear is designed to fit the Amara Full Face CPAP Mask from Philips Respironics®. The Amara Headgear is available in two sizes: Reduced Size (RS) and Standard Size. Both sizes can be used with any size Amara Mask assembly. The Amara Full Face Masks that are shipped with the Reduced Size (RS) headgear are the Petite and Small sizes. Medium and Large Amara Full Face Masks are shipped with the Standard Size headgear.