Are you troubled in being sensitive to , dust or air pollution? Our Invisible Nasal Filters are designed to solve your problems. A physical way to block inhaled allergens; a good alternative to nasal spray and a good combination with it to achieve the best - results. Features: Physical Protection from : Nasal Filter is a physical way to block inhaled allergens. A good alternative to nasal spray and a good combination with it to achieve the best - results. Instant : Advanced electrostatic filters are very effective in keeping allergens(, dust, dander & mold, pet hair, PM 2.5 etc.) from getting into your nose. Protect you against nasal allergies, sinusitis, and rhinitis. Ergonomic & Comfortable: The filter frame is designed according to your nostrils' natural shape, Round or Slotted, for the best comfort, fit and seal. Soft & Material: The frame is made from very soft , Latex-free, BPA and Phthalate-free. It will deform according to your nasal passage to fit you the best. Invisible & Economic: The nasal filter is put in your nose and the black retainer rings do a great of hiding the white filters. Reusable and very easy to rinse. You can wash it with soap water or 70% every day and dry it in shade. ABOUT SETTING UP: Remove a pair of filters from the silver bag. One side of the filter is net and the other side is fiber. Install a pair of replacement filter into each frame with its net side facing you. Then install the black retainer ring into each frame. The filter and black retainer ring should now be secured by the frame tabs.