Solid top design reduces the chance of premature caking, clogging, or soiling with dirt, grime, water or dust Protective casing aids decontamination practices Temperature resistant cover protects filter media from heat, sparks or physical damage Patented bonded web technology has more surface area than many standard filters which helps lower breathing resistance making it more comfortable to use 3M™ Bayonet Connection System ensures precise and secure locking Low profile and well balanced twin filter design Suitable for use with 3M™ 6000/7500 Series Half Face Respirators and 3M™ 6000/7000 Series Full Face Respirators