A cushion (10, 30 56) for a patient interface device (8, 46), comprising: a patient contacting portion (12, 32 60); a connection portion (16, 36, 64) configured to provide a secure connection between the cushion and a support structure; and a middle portion (14, 34 62) provided in between the patient contacting portion and the connection portion, the middle portion including one or more wall portions (18, 20, 22, 24, 34, 66, 68, 70, 72), wherein the one or more wall portions include a plurality of voids (26, 74) therein, wherein the patient contacting portion and the one or more wall portions are made of a material having a hardness of between 5 and 60 on the Shore 00 scale, characterized in that the plurality of voids (26, 74) comprise at least one first void provided in an inner side of the one or more wall portions and at least one second void provided in an outer side of the one or more wall portions, and in that the parts of the one or more wall portions not having the plurality of voids (26, 74) provided therein all have a cross-sectional thickness of between 4 and 10 mm, wherein the one or more wall portions comprise an apex wall (18, 66), a left side wall (20, 68), a right side wall (22, 70) and a bottom wall (24, 72), wherein the plurality of voids comprise: (i) a first void (26A, 74A) provided in an inner side of the apex wall, the left side wall, the right side wall and the bottom wall, (ii) a second void (26B, 74B) provided in an outer side of the apex wall, the left side wall, and the right side wall, (iii) a third void (26C, 76C) provided in the outer side of the left side wall below the second void, (iv) a fourth void (26D, 74D) provided in the outer side of the right side wall below the second void, (v) a fifth void (26E, 74E) provided in the outer side of the left side wall at least partially above the third void and below the second void, (vi) a sixth void (26F, 74F) provided in the outer side of the right side wall at least partially above the fourth void below the second void, and (vii) a seventh void (26G, 74G) provided in the outer side of the bottom wall, wherein the at least one first void and the at least one second void are aligned across from one another such that at least a portion of the first void overlaps a portion of the second void with a section of the middle portion (14, 34 62) being located therebetween. a patient contacting portion (12, 32 60); a connection portion (16, 36, 64) configured to provide a secure connection between the cushion and a support structure; and a middle portion (14, 34 62) provided in between the patient contacting portion and the connection portion, the middle portion including one or more wall portions (18, 20, 22, 24, 34, 66, 68, 70, 72), wherein the one or more wall portions include a plurality of voids (26, 74) therein, wherein the patient contacting portion and the one or more wall portions are made of a material having a hardness of between 5 and 60 on the Shore 00 scale, characterized in that the plurality of voids (26, 74) comprise at least one first void provided in an inner side of the one or more wall portions and at least one second void provided in an outer side of the one or more wall portions, and in that the parts of the one or more wall portions not having the plurality of voids (26, 74) provided therein all have a cross-sectional thickness of between 4 and 10 mm, wherein the one or more wall portions comprise an apex wall (18, 66), a left side wall (20, 68), a right side wall (22, 70) and a bottom wall (24, 72), wherein the plurality of voids comprise: (i) a first void (26A, 74A) provided in an inner side of the apex wall, the left side wall, the right side wall and the bottom wall, (ii) a second void (26B, 74B) provided in an outer side of the apex wall, the left side wall, and the right side wall, (iii) a third void (26C, 76C) provided in the outer side of the left side wall below the second void, (iv) a fourth void (26D, 74D) provided in the outer side of the right side wall below the second void, (v) a fifth void (26E, 74E) provided in the outer side of the left side wall at least partially above the third void and below the second void, (vi) a sixth void (26F, 74F) provided in the outer side of the right side wall at least partially above the fourth void below the second void, and (vii) a seventh void (26G, 74G) provided in the outer side of the bottom wall, wherein the at least one first void and the at least one second void are aligned across from one another such that at least a portion of the first void overlaps a portion of the second void with a section of the middle portion (14, 34 62) being located therebetween.