I recently went on a 7 day backpacking trip in Wyoming's Wind River Range and packed the Natrapel 3.4 oz., as I'd heard the area could be quite buggy. At a local outdoor store before I set out, I got warned by one of the workers that this year was EXTREMELY buggy - one of the worst year's they'd had in a long time. He was doubtful that any insect repellent would be effective for long in the conditions. Needless to say, I was quite concerned but unwilling to turn back. Imagine my excitement went I went the whole trip only getting 2 bug bites! The first day of the trip I applied Natrapel in the morning (probably around 7 or 8 am). I didn't feel the need to reapply until 5 pm that night! At one point later in the trip we walked through swarms of mosquitoes - I could barely breathe without inhaling them - yet I emerged completely unscathed. Long story short, my experience this trip was that if I thoroughly and carefully applied Natrapel to all my exposed skin (as well as to my hat), the bugs wouldn't bit me! Of course, when I forgot to apply they would, which is how I ended up with 2 bug bites - you better believe I didn't forget often! I highly recommend Natrapel to anyone heading into buggy areas who needs all day protection, or for use at home. I normally don't like wearing bug spray, but Natrapel smells fine and didn't feel greasy or oily on my skin, so I actually forgot I was wearing it just a few minutes after applying. My favorite repellent by far!