Pyramex Safety - Dust Mask - Disposable Dust Mask with Valve - Valve – One way valve for easy exhalation. N95 – 95% efficient respiratory protection in non-oil areas. Proper design – Large coverage providing a comfortable fit for the user. Elastic straps – Ultrasonically welded straps eliminate the need for staples which can irritate the skin. Smooth layers – Soft, smooth outer and inner layer is comfortable on the skin, unlike other makes which can be uncomfortably rough. Adjustable nosepiece – Outer aluminum nosepiece holds shape and provides a proper fit during use. Durable shell – Thick materials prevent collapsing and provide extended use. Foam Strip – Inner foam strip reduces the potential for eyewear fogging. Material – Maintenance-free construction and material offers low breathing resistance. Fit – One size fits all.