The specially developed BioGenAg fiber includes active biogenic silver right in the core and not subsequently applied to the surface only. Thanks to that the bactericidal/virucidal functionality and the effectiveness remain unchanged over time, even after repeated washing. With its effectiveness of over 99 %, the neckerchief not only stops, but also completely eliminates bacteria and viruses at their RNA level within a few minutes. Besides that, the unique filter protects users against dangerous particles (dust, viruses, bacteria, microbes, pollens, allergens, etc.).