JONTY NEOPRENE MASK SERIESPOLLUTION WHY SHOULD WE NEED THE DUST MASK? Our environment is full of dust, haze, vehicle smoke and air pollution. The dust mask can keep you from dust, dirt,smoke, fumes or particulates that effect your breath in the air. APPLICATIONSSuitable for all kinds of outdoor activities where dust may be present. Such as: Urban cycling, Mountain biking, Horseback riding, Skiing, Jogging, Climbing, and Motorcycling, etc. INSTRUCTIONS Put the dust mask between the nose and chin. Back of the mask can be fixed with a Velcro. Check if it is appropriate: cover your face with your hands, then breath hard and feel if there is air flow. Make sure you are comfortable after wearing this mask by adjusting the back of the strap For maximized performance, the mask must be sealed properly around the nose and mouth, so that all inhaled air can pass through the filter. Make sure you are comfortable after wearing this mask by adjusting the back strap. DURATION OF FILTER AND VALVEDuration time for filter depends on the breathing rate of the user and the pollution level. We recommend to replace the filter once the mask is used extensively. The valve should be replaced if damaged. NOTEPlease kindly know that measurement of size above is for your reference, there might be slight allowable discrepancy. The color of the item might appear slightly different because of different screen display setting.