Materials: high quality silicone
The main body is using the high quality silicone which is anti-aging, anti-allergic and easy to clean.
The double silicone mask edge is very good for air tightness, parts of
mouth and nose can fit various face
PC window is big, anti fog inside and anti friction outside
The threaded interface is very convenient for replace cartridges
Conforms to EN 136:1998,GB2890-2009
