The WHO recommends Face coverings are comprised of at least 3 layers of material. An outer layer and inside layer and a middle layer which may be a removable filter insert. It recommends that the outer materials repel airborne droplets and inner layers absorb droplets.
The CDC states masks with at least 2 layers of fabric are most likely to reduce the spread of COVID-19 when they are widely used by people in public settings. They should be made from washable, breathable fabric and may help prevent the spread of COVID-19. They should not feature a 1-way exhalation valve.
The Trtl Protect Mask is constructed from a combination of layers of materials that work in tandem to filter the air that you breathe in and out, capture airborne droplets and dry quickly. Air breathed in and out, flows through a minimum of 3 layers of material or up to 8 layers with the included, removable 5 Layer PM2.5 Filter Insert. The outer and inner materials of the mask are made from a tightly woven 'Sports Jersey' made from an 80% Polyamide/20% Spandex blend that absorbs airborne droplets and then dries out quickly. Sandwiched in-between the outer & inner layers of the mask is a PU coated Polyester waterproof membrane that blocks airflow and water droplets through the mask, other than directly in front of the Filter Pocket. Here air passes through another layer of Sports Jersey and the 5 Layer PM2.5 Filter Insert.
DISCLAIMER: The Trtl Protect Mask is designed to provide a close fit, similar to a graded personal protective mask. However, it is not guaranteed for use in a medical setting or where certified protection is required.