4-layered protective mask is highly effective in filtering air pollution and fine dust. The K94 Mask effectively blocks 94% or more of fine particles, pollution, and outside debris. The KF94 mask filters out most airborne particles, protecting wearers from exposure to harmful tiny particles down to 0.4um in diameter. KF94 offers significant protection over normal masks. Made with a soft Nylon elastic for a very comfortable fit around the ears. Easy ear control with adjustable ear straps, does not collapse, does not bend uncomfortably, sturdy and will not dent makeup for ladies, does not fog glasses, Adjustable straps. No odor, reusable.