These are full 3 ply masks with “melt-brown” in the middle, Not the fake ones that are also on the market
(Note that due to extreme high demand world wide, these may be in plain packaging, these are still confirmed as 3- ply “surgical” masks
A proper surgical mask is usually made of three layers, including an outer hydrophobic non-woven layer, a middle melt-blown layer, and an inner soft absorbent non-woven layer. These three layers have their specific functions: the outer layer is intended to repel water, blood and body fluids; the middle melt-blown layer is the critical highlight of a surgical mask, it is designed as the filter to stop germs from entering or exiting the mask; and the inner layer is intended to absorb water, sweat and spit.
The 3-ply surgical mask is as effective as N95 respirators in preventing respiratory coronavirus disease like COVID-19 or viral infections like influenza.