Cloth masks are comfortable and protects others but not you. Disposable masks protects you with a filter but they are not comfortable and have a short duty cycle because the moisture in your breath quickly degrades the filter fibers.
We combined the comfort of a cloth mask with the protection of a disposable electrostatic filter in which the inner layer protects the filter and the filter protects you as well as others.
We tested eRezp™ and these are the results
A filter lasts about one week.