Healthcare Scientists redesign face mask to improve comfort, protection Updated : September 05, 2020 01:57 PM IST The scientists said the washable fabric filter is made of a blend of Spandex and polyester, adding that after 20 washings, the prototypes have not shrunk or lost their shape. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.