Respiratory mask

A mask comprising:

• a transparent mask body (1) having a perimeter comprising an upper portion (36), a right lateral portion (2), a left lateral portion (3), and a lower portion (4);
• said mask body (1) being curved from the upper portion (36) to the lower portion (4),
• a membrane (8) located on the perimeter of the transparent mask body (1);
• at least one unit (15, 16);
• a right means (9) and a left means (10);
• the lower portion (4) of the perimeter of the mask body (1) is horizontal,
• the right lateral portion (2) and left lateral portion (3) of the mask body (1) are vertical,
• the right means (9) and the left means (10) are fixed at the angles (11,12) formed between the upper portion (36) and the right lateral portion (2) and left lateral portion (3) of the perimeter of the mask body (1), respectively,
• the membrane (8) extends outward from the mask body (1) having one end fixed to the mask body and a free end, wherein, at the upper portion (36) of the perimeter of the mask body (1), the free end of the membrane (8) extends perpendicularly away from the mask body (1), and
• the upper portion of the perimeter of the mask body (1) comprises a right curvature (5) and a left curvature (6) originating from its center (7), curving downward and then rising upward,
• characterized in that:
• the membrane (8) increases in width from top to bottom along the lateral portions of the mask body perimeter (1),
• at the lower portion (4) of the perimeter of the mask body