This reusable mask consists of three layers of fabric and a front pocket into which the filter is inserted. It blocks 99.97 per cent of particles of the size 0.3 microns (US standard N100) and retains its protective effect even after repeated cleaning with water or alcohol. Therefore, both the mask and the filter cause significantly less waste and expenditure than normal disposable medical masks. At the same time, the mesh structure of the mask ensures better breathability.