This half facepiece reusable 3M 7502 Respirator Series uses advanced silicone material to help provide comfortable and durable respiratory protection. The 3M™ Cool Flow™ Valve helps make breathing easier and can reduces heat and moisture build-up for cool, dry comfort. The Half facepiece is the ultimate reusable respirator. The 3M 7500 features and dual mode harness for standard or drop down mode.