3M 7500 Series Respirator Easy Breathing, comfort and durability Features :Adjustable Head Cradle allows wearer to adjust for optimum fit and comfortSoft Seal Design, Advanced silicone material polymer provides a softer feel on the face, Unique adjustment design helps reduce tension and pressure points on the face for unsurpassed comfortPatented 3M Cool flow Valve design helps make breathing easier, helps reduce head and moisture buildup for cool, dry comfortUnique Exhalation Valve Cover directs exhaled breath moisture downward, Smooth surface allows for quick and easy cleaning, helps reduce debris from depositing in valve areaDual-Mode Head Harness adjusts easily so user has the option to wear the respirator in either traditional or drop-down modeOptions :7501 - Dual cartridge half facepiece, small7502 - Dual cartridge half facepiece, medium7503 - Dual cartridge half facepiece, large