ADJUSTABLE. String ends on both sides of the mask can be adjusted into a perfect fit for the user. Perfect fit allows the medication to be solely inhaled into the lungs. COMFORT. The mask is anatomically designed to provide maximum comfort for patients while undergoing treatment. An excellent feature, especially for pediatric patients, who tend to get anxious while in treatment. CLEAR TRANSPARENT SHELL. The masks, tubings, bottle and mouthpiece are all designed in a clear transparent shell for easy observation and monitoring. COST EFFECTIVE. The whole accessory set is practically inexpensive and it already comes with replacement filters. It is affordable and readily available for use for in-home patients.