JoyroomCY201/PM2.5 Mask Color: Gray Double Layer Air Filter Adjustable Ear Strap These are Joyroom Cloth refill core high efficient mask. These 2 layered mask help reduce dust, dirt and odors when traveling or while working, optimally protecting the respiratory system at all times. Built in ear filter and the ear strap can be adjusted according to your convenience. Made from skin friendly cloth material. Brand other SKU OT776EL00EELGNAFAMZ-192071 Model CY201/PM2.5