One’s with valves and very thin ones are NOIT what you want to be wearing….
The Centers for Disease Control and Prevention updated its website to warn against using masks with exhalation valves or vents to slow the spread of the coronavirus.
Masks with vents or valves “allow air to be exhaled through a hole in the material, which can result in expelled respiratory droplets that can reach others,” the CDC website now states. “This type of mask does not prevent the person wearing the mask from transmitting COVID-19 to others.”….
“These neck gaiters are extremely common in a lot of places because they’re very convenient to wear,” he said. “But the exact reason why they’re so convenient, which is that they don’t restrict air, is the reason why they’re not doing much of a job helping people.”
A number of prominent activewear companies make neck gaiters, and they are generally not designed for medical use. In April, for example, Buff, a company known for multifunctional head and neckwear, issued a public statement emphasizing that its products are not scientifically proven by the CDC and the World Health Organization to be a useful form of protection during the pandemic.
“Buff performance head and neckwear are not intended to be used as medical-grade face masks or as a replacement for N95 respirators as effective measures to prevent disease, illness, or the spread of viruses,” the statement said….