In light of the coronavirus (Covid-19) pandemic, face masks are in huge demand right now. Millions of masks are needed, and you can help. If you’ve got a sewing machine or a simple hand sewing needle, this is one way you may be able to help out.

The Centers for Disease Control and Prevention says that DIY masks can be made in times of crisis as a last resort and “should ideally be used in combination with a face shield that covers the entire front (that extends to the chin or below) and sides of the face.”

A study of homemade face masks by SmartAirFilters.com found that cotton T-shirts and cotton pillowcases are the best materials for making DIY face masks, based on their ability to capture particles yet remain breathable, and that they perform comparably to surgical-grade masks. It is however important to add a non-woven fabric (e.g polypropylene) in between the cotton layers.