Pull the scarf over your head so it sits around your neck. Pull the scarf up around your face when in use. To achieve 100% of the Face Guard Pollution Scarf filtration efficiency, it must be worn so that its rectangular filter shields your mouth and nose. To ensure a tight fit you must adjust both the tightness of the elastic band at the back of your head and the shape of the adjustable metal clip on your nose. The nose clip is padded with a soft foam layer therefor there are no pressure points even after a longer wear. Unlike a face mask, the Face Guard Pollution Scarf can be worn already around the neck and when you need protection you can pull it over your nose quickly.