Automatically adjustable cushion of respiratory mask for better fit

Disclosed embodiments may relate to a respirator mask (10) with an automatically adjustable cushion (20) about its periphery (18). In some embodiments, the cushion (20) is fluid-filled so that it conforms readily to the user's face. The conformability of the cushion (20) tends to allow the cushion (20) to fill in the gaps between the mask body (10) and the user's face, providing s snug fit for the specific facial contours of particular user and allowing the mask (10) to be used across a wide demographic of users.