4 layers techwear mask featured 2L Waterproof Breathable Outer Shell wit HeiQ Viroblock Treatment & 2-Ply Bamboo Cotton Fabric with natural Anti-Bacterial and Hypoallergenic properties. HeiQ Viroblock is an newest technology from HeiQ. HeiQ Viroblock is a treatment designed to inhibit the growth and persistence of bacteria and enveloped viruses on textile surface. W210 Face Shield techwear mask provide protection and comfort at the highest level. W210 Face shield techwear mask adjustable earloop for comfort and upgradeable hed straps.