... 2) Layer: 4ply; 3) Free of maintencance; 4) Protect against dust. face mask with elastic band Features of face mask ... fabric: Pp non-woven, carbon, filter and needle puched.Made with nonpoisonous, non-allergic and non-simulating materials, low breathing ... body has more breathing space.With a alexible band: fixed easily, more comfortable and durable.Maintenance-free, hygienic, clean, environment ...