Early mask studies have revealed that a combination of a stretchy fabric, such as T-shirt material, and cotton are most effective. Also, the studies show that two layers of these fabrics are not as effective as three layer masks. This is why our masks are a blend of T-shirt and cotton materials. In addition to having the most effective fabric combination, the masks are each three layers and pass the candle test. Inside of these masks is a nose wire and filter pocket. A nose wire can help with the fit of your mask, which scientists and doctors say is even more crucial as layers. Having a nose wire also helps prevent glasses fogging up. The benefit of having a filter pocket is to add extra protection.
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NPR Overview of Bill Nye's Candle Test