Comfort-Air sets the standard for comfort and compatibility. Molded from pure silicone, the wide interior flange, deep chin cup and rolled edges of the Comfort-Air mask make it the "hands down" favorite for long term comfort and fit. The textured no-slip face seal and swivel retainers ensure proper placement. Extra large inhalation valve, unique corrugated exhale valve and minimized "dead air" space provide low breathing resistance and added comfort. Patented multi-position cartridge placement and low-fitting mask design allow maximum compatibility with other PPE. NIOSH approved.