N95s have a tighter fit to your face than cloth masks and are made with a special material designed to block 95 per cent of harmful particles.
The fibres are pressed closer together than in cloth masks and have an electrostatic charge that attracts molecules to stick to the mask rather than passing through.
KN95s and KF94s offer a similar level of protection. A full list of masks that meet an international quality standard is available on the CDC website.
How to identify Fake Masks?
But be careful when buying. The counterfeit market is huge, and about 60 per cent of KN95s in the US are fake and do not meet quality standards, according to the CDC.
It’s hard to tell just by looking if a mask is counterfeit, so experts suggest buying directly from reputable sellers. Project N95 is also a known seller of valid brands, and Marr says she buys masks through industrial suppliers like Grainger or McMaster-Carr.
If you find certain N95s difficult to wear for long periods, experts suggest exploring the different shapes and styles available to see what works best for you.