●Top valve is hided,down valve is protected by valve cover: not easy to pollute,convenient to disassemble and clean;

●Double exhale valve design:exhale valve on nose and mouth,reduce hot-air circulation;

●Four valves design is NANHE patent: the resistance of our product is lower 20% at least than other similar imported product;

●Ring head belt design:keep more durable of polyester spandex elastic belt;

●Advanced liquid silicone :soft,comfortable,fit,long service life,high temperature resistance,anti-aging;

●Clasp interface structure: easy to replace filter box or filter cotton.

●Can be connected with filter box and filter cotton,and used as protective poison gas mask or dust proof mask;

●In line with GB 2890-2009 standard and GB 2626-2006 standard,have Europe CE certification and China LA & QS certification;

●Package:1pcs/bag,6pcs/box,36pcs/ctn