Breathing mask with comfortable face cushion. Holds securely during vigorous workouts with a silicone rubber head strap that can be adjusted for any head size. The cushion is air-inflated and the inflation can be adjusted for comfort. The mask has extra-large inhalation and exhalation ports for easy breathing when exercising. One-way valves on both inhalation and exhalation ports prevents breathing outside air. Includes a third safety port so you can't be cut off from outside air in the event of a power failure. Assembly includes mask, adjustable strap, breathing bag, bacterial/viral filter, tee, air hose, and air syringe for adjusting the air cushion pressure .