The idea i think is great but need to improve the filters received a few days ago there a bit tight but hard to judge what size your nostrils are i went for medium there good and work however there are limited filters with only 6 privided they would last a maxium of 30 days if you didnt use every day and have yet to find extra filters as a product they are good and work but i think they need proper sizing and providing more filters or a website where you can get them i bought these nose filters as i have a number of allergies and i wanted to see if a filter would h