They come in all shapes, sizes and colours but not all masks, designed to stop droplets from getting out, are equal. Scientists from Duke University tested 14 types of masks and face coverings, ranking them from the most to least effective. 1. Medical N95 mask 2. Surgical mask 3. Polypropylene and cotton 4. Polypropylene apron mask 5. Cotton mask with ties 6. Two-layer cotton with ties 7. Valved N95 8. Hand-sewn cotton 9. ‘MAXIMA AT’ mask 10. Single-layer cotton 11. Pleated two-layer cotton 12.

Not all masks are made equally, just ask "Mask Nerd" Aaron Collins. The aerosol scientist breaks down the best masks for filtration, fit and comfort — and how to spot which masks are legitimate. https://cbsn.ws/3H808ag | CBS Mornings

250K views · 253 reactions | We tested more than 20 different consumer face masks and found that style, fabric and fit make a difference at protecting you against the coronavirus. | CBC News: Marketplace | Facebook

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