I have been suffering with pollen allergies this season and getting insufficient relief from OTC drugs. My husband had reruns of Shark Tank playing on TV, and the inventor of this product suddenly was on. I hopped on Amazon before the segment ended and found the product. It arrived yesterday – a thin envelope with seven sets of these nasal filters. I put on a pair last night, and went to bed. BEST SLEEP I’VE HAD IN AGES! No stuffy nose all night! Now that I’m up, I pulled them off and while walking around, it’s back to nose blowing and coughing.