Amazing Finds Nano Mask is a washable filtering mask. It can withstand at least thirty hand-cleaning cycles without losing its ability to trap fine dust particles. The material, placed on appropriately design, lets the entire mask maintain its original shape through the washes. Our mask continue filtering up to 80% of 600 nanometer-wide particles Within the material are nanofibers, with a diameter of between 100 and 500 nanometers, that are arranged perpendicularly to each other via a novel insulation block electrospinning process. This creates a fine mesh that lets air through while blocking very fine particles. Moreover, the material is highly water resistant and so dries out quickly before being used again.