Strong st-m40-3b silicone gas mask (without filter box)

Product features: unique fan-shaped exhalation valve, small exhalation resistance, no suffocation, faster discharge of moisture and hot gas in the cavity, one-way drainage valve, discharge of specific internal steam, dry and comfortable, high efficiency activated carbon, high adsorption capacity, low resistance;
unique guide groove design in the filter box, no waste of active carbon, long service time, elastic band and headband combination, reduce head and neck pressure It does not affect the wearing of other protective products.
size: One size fits all