A clip connector (300, 400, 405) for connecting a headgear (110) to a mask body (105), comprising: a body portion (505) configured for attachment to the headgear； and a hook portion (300, 500), the hook portion defining a U-shape having a first leg, a second leg and an entrance (312) to a space between the first leg and the second leg, the hook portion comprising: a central portion (315, 460)； a pair of outer portions (320, 470) positioned on opposing sides of the central portion, wherein each of the central portion and the pair of outer portions define a portion of both the first leg and the second leg； and an interference bump (310) on at least one of the central portion and the pair of outer portions, the interference bump extending into the entrance to the space； wherein the central portion and the pair of outer portions are configured to flex independently of one another.
