The KAWACH mask has Multi layers. Layer-1 (inner layer) Ultra-soft cotton fibre, woven mesh, bio-washed fabric for anti-allergic, comfortable and extra filtration, Layer-2 (middle filter layer) melt-blown/spun bond technology based 3 layer filter system for ultra-high filtration greater than 99% at 3 micron, Layer-3 (Outer fabric layer) bio washed fabric for first layer protection from large particles and splash, Materials are tested as per ASTM Standards from an NABL Accredited Lab. When do I need to change my KAWACH? When you start having issues in breathing while wearing the mask, it's time to change, How to take care of KAWACH? Following are washing instructions: a) Hand wash in lukewarm water (30-40 degree), b) Do not use bleach, c) Line Dry, d) Do not squeeze or rinse, e) No Steam Press, Is KAWACH recommended for high risk healthcare professionals? KAWACH is recommended for the general public with low risk of exposure.