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

●Thread interface structure, easy to replace filter box and filter cotton;

●Four valves design the resistance is lower 20% at least than other similar imported products;

●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;

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

●can connect with gas filter box and cotton filter box, as dust proof mask and protective gas mask.

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

●Package:1pcs/bag,6pcs/box,36pcs/ctn.