Large Capacity Air dilution is minimised due to large capacity 280ml face piece. Soft and Flexible The construction of the facemask ensures maximum comfort during sleep. Latex Free Straps Latex free elastic straps eliminate the risk of allergic reactions. Horizontal Gas Flow Eye irritation is avoided due to Horizontal Gas Flow. Exhalation Vents Extraneous air dilution is greatly reduced by Exhalation Vents, enhancing CO2 washout and preventing pressure build up.