When I asked VogMask and Metamasks who certifies organic cotton in their masks, Metamask was the only one that replied and emailed me its certificate, which was from Global Organic Textile Standard (GOTS). Its website posted lab results on how its masks capture bacteria, viruses, and pathogens at 0.3+ microns. And it lists the manufacturer of its nanotech, plastic polypropylene, and carbon filter...
BY Jessian Choy | SEP 18 2020 on SIERRA CLUB.
Full article HERE.