The Viroblock Face Mask has been manufactured with Swiss HeiQ Viroblock technology which is proven effective against germs in the laboratory tests. This reusable Face Mask is an innovative design ensuring maximum fresh air flow through 2 layers of kill-trap-kill technology the Viroblock Face Masks provide protection and comfort. Colours: Grey. Features: Product is reuseable and the Viroblock technology remains effective for up to 30 gentle hand washes in cold water. Made in Sri Lanka. Packaging: Polybag. Materials: 130gsm Cotton with Viroblock technology supplied by HeiQ