1. Economical and durable-do not discard the mask. Use organic anti-allergic aviation materials. Washable. Washing will not reduce the dustproof effect, which is more economical and more environmentally friendly than disposable masks. 2. New technology materials-new organic polymer sponges are different from ordinary sponges. Due to their three-dimensional structure, they can filter fine particles in the air. Soft, delicate and breathable, very suitable for summer clothes. 3. Humanized design-perfectly attached to the face, with excellent elasticity and softness, while maintaining its shape. It is 2 mm thick, very breathable, and will not cause oxygen deprivation, breathing difficulties and congestion. Comfortable and elegant. 4. Function-Unlike ordinary masks that use a multilayer structure to form a mesh structure to avoid dust, this PM2.5 mask is made of polyurethane and has a 3D structure. After precise sewing, its taste becomes very high. -The dust barrier with a dustproof rate of 99% has a strong defense against pollen, bacteria and dust. specification: Product Type: Mask Material: 97% polyester fiber, 3% elastic fiber 3pcs / 9pcs / 15pcs *Mask