The KAWACH (Model: Elite) has multi layers. Layer-1 (inner layer) – ultra-soft cotton fabric, plain knit structure, bio-washed fabric for anti-allergic, comfortable and extra filtration from large particles; Layer-2 (middle filter layer) melt-blown/spun bond technology of a 3 layer nonwoven filtration system (SMS filter; 3 layer protection) for ultra-high filtration greater than 99% at 3 micron; Layer-3 (outer layer) plain knit structure, bio-washed fabric as first layer protection from large particles and splash. Filtration is tested as per ASTM Standards from an NABL Accredited Lab. Size Options: As per face size, 3 size variants are available in this model, XS for Kids up to 6 yr, S for Kids up to 16 yr, and M size for adults for men and women. 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 luke warm water (30-40 degree), b) Do not use bleach, c) Line Dry, d) Do not squeeze or rinse, e) No Steam Press; Iron at less than 60 Degree; Is KAWACH recommended for high risk healthcare professionals? KAWACH is only recommended for general public with low risk to exposure.