COMPAN,INC Breathe Safe Anti-Pollution Tail Gas Clean-up Cycling Racing Bike Cover Protection Gray Face Mask Size: Regular. Package:1 piece mask.1 more easy replaceable filters. Mouth have ventilation holes, the magic stick fixed.With activated charcoal filter, filters out exhaust emissions Material: soft neoprene.Comfortable wearing, feel is good, dustproof, thermal effect is very good. High quality Anti-pollution bicycle cycling Face Mask mouth-muffle with filter Face Shape Design, Nose portion of an aluminum sheet secured to prevent slipping