Equipped with proprietary Quick Latch System for easy take on and off in non contaminated areas with no need to take off hard hat or adjust straps. Outside the hazardous area ,lets you take a quick breath or conversation with a simple flip of lever. Proprietary 3M Cool Flow? valve helps reduce heat and moisture. P-Series particulate filter is oil resistant. Adjustable head straps. Convenient reusable design. Lightweight silicone face seal for premium comfort. Grey.