An adjustable headgear assembly (10) for securing a respiratory interface device (26) to the head of a patient that includes a headgear member (12) that fits over the crown and back portion of a human head. The headgear member (12) has upper side portions (14) positionable above and forward of the ears of a human head and lower side portions (16) positionable below the ears and along the back portion of the head. A pair of upper retention members (20) are provided. Each pair of upper retention members (20) extends downwardly and forwardly from the upper side portions (14). A pair of lower retention members (30) extend forwardly and upwardly from each of the side portions. Each pair of upper (20) and lower (30) retention members are structured to engage a respiratory interface device (26).