ZG Mask Active Carbon Filters Anti-dust Sports Half Face Mask Velcro adjustable size,suitable for most people to protect the face Protection of the face,the material is soft,comfortable to wear Fashion design,long-term use of deformation Active carbon filters removes 99.9-percent of dust, chemicals, fumes and particulates According to the person face design, keep out the bridge of the nose the following part, the bridge of the nose department have aluminum sheet fixed, to prevent the slide