I freaking love this product. I found it by fluke and now can’t go without it. This formula when applied into the nose helps help maintain moisture on a time release. This means that you get 12 hours of moisture and hydration in your nose. Not only is this perfect for flying and altitude and humidity changes but also helps for when you are feeling ill, allergies, can’t sleep, or just overall dryness this four pack has options to help you with whatever you are facing!