Precepts procedure masks are constructed of quality materials, including tissue, polypropylene, and cellulose, a wet-laid nonwoven. Enclosed nosepieces are malleable to ensure a snug, comfortable fit. Earloops are constructed from a soft, non-irritating material with good elasticity to ensure easy donning and removal. Precepts procedure masks are cool and comfortable, allowing for excellent breathability. All procedure masks provide comprehensive protection, with bacterial filtration efficiencies > 98%. All masks have Class 1 flammability.