No mask can completely guarantee protection against infectious disease.  A good quality mask with high-quality filtration materials can help reduce the spread of airborne contaminants.  It should not be used as a complete replacement for social distancing or proper hygiene.We have taken great care in putting our masks through stringent testing to prove efficacy.  We have sent our masks to Nelson labs who is a world leader in mask performance testing.https://www.kandymask.com/pages/filter-face-mask-test-results