PFL®(Positive Facial Lock) Masks are fluid resistant and feature the exclusive Twist-Seal® chin piece which allows a custom fit to any size face, reducing the potential of small particles to be inhaled around the borders of the face mask. This unique design virtually eliminates gaps at the border of the mask. This Particulate Respirator is NIOSH approved and meets CDC and WHO guidelines. Features exclusive Magic Arch® and PFL® design. These unique design features permit the respirator to be “Custom Fit” to virtually any shape face.