Headgear for a patient interface, the headgear comprising: one or more straps (3320, 3330) each having a first end for connecting to a mask; wherein the first end of at least one of the one or more straps (3320, 3330) comprises: a connection portion, the connection portion being grippable by a user to pull the strap (3320, 3330) to increase a tension in the strap (3320, 3330); a first rigid member; and a second rigid member (3355, 3356, 3357) that extends from a resilient carrier (3362, 3364) that is connected to the connection portion, the second rigid member (3355, 3356, 3357) being movable relative to the first rigid member when the connection portion is pulled by the user, wherein at least part of the second rigid member (3355, 3356, 3357) is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance; wherein the resilient carrier (3362, 3364) is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap (3320, 3330), wherein the first rigid member includes a channel with a boss extending from a surface of the channel, and wherein the second rigid member includes an aperture, the second rigid member (3355, 3356, 3357) being receivable within the channel and the boss being receivable within the aperture, and wherein the second rigid member (3355, 3356, 3357) includes at least one protrusion and the first rigid member includes at least one projection, wherein contact between the at least one protrusion and the at least one projection is configured to cause the second rigid member (3355, 3356, 3357) to deflect. one or more straps (3320, 3330) each having a first end for connecting to a mask; wherein the first end of at least one of the one or more straps (3320, 3330) comprises: a connection portion, the connection portion being grippable by a user to pull the strap (3320, 3330) to increase a tension in the strap (3320, 3330); a first rigid member; and a second rigid member (3355, 3356, 3357) that extends from a resilient carrier (3362, 3364) that is connected to the connection portion, the second rigid member (3355, 3356, 3357) being movable relative to the first rigid member when the connection portion is pulled by the user, wherein at least part of the second rigid member (3355, 3356, 3357) is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance; wherein the resilient carrier (3362, 3364) is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap (3320, 3330), wherein the first rigid member includes a channel with a boss extending from a surface of the channel, and wherein the second rigid member includes an aperture, the second rigid member (3355, 3356, 3357) being receivable within the channel and the boss being receivable within the aperture, and wherein the second rigid member (3355, 3356, 3357) includes at least one protrusion and the first rigid member includes at least one projection, wherein contact between the at least one protrusion and the at least one projection is configured to cause the second rigid member (3355, 3356, 3357) to deflect. a connection portion, the connection portion being grippable by a user to pull the strap (3320, 3330) to increase a tension in the strap (3320, 3330); a first rigid member; and a second rigid member (3355, 3356, 3357) that extends from a resilient carrier (3362, 3364) that is connected to the connection portion, the second rigid member (3355, 3356, 3357) being movable relative to the first rigid member when the connection portion is pulled by the user, wherein at least part of the second rigid member (3355, 3356, 3357) is arranged to strike the first rigid member to cause at least an audible alert when the second rigid member travels further than a threshold distance; wherein the resilient carrier (3362, 3364) is constructed and arranged such that the threshold distance corresponds to a desired tension limit for the strap (3320, 3330), wherein the first rigid member includes a channel with a boss extending from a surface of the channel, and wherein the second rigid member includes an aperture, the second rigid member (3355, 3356, 3357) being receivable within the channel and the boss being receivable within the aperture, and wherein the second rigid member (3355, 3356, 3357) includes at least one protrusion and the first rigid member includes at least one projection, wherein contact between the at least one protrusion and the at least one projection is configured to cause the second rigid member (3355, 3356, 3357) to deflect.