The 1TCA mask and snood are treated with HeiQ Viro block. HeiQ Viroblock is a product that treats the fabric with biocidal silver to prevent contamination by Germs and Microbes. Reusable and lasts up to 30 washes at 40°Celsius. Both masks & snoods are produced from GRS certified recycled polyesters, Fully recyclable & made in the UK.