Special design for deaf and hard of hearing people. With the clear plastic window, the possibility to read lips and understand facial expressions will not be affected by the mask. Made with high quality materials and soft, comfortable face protection. The soft ear cords fabric is adjustable to fit all head sizes and shapes, and will not hurt ears even if worn for a long time. The membrane is made with safety standard materials, which can be used by adults and children, to help maintain health and safety when working or going out.