3M UltraThon Insect Repellent - 34 Percent DEET - 2 fl. oz.

Priced: $10.50 Rated:   - 4 stars out of 5 by 31 reviews.
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3M UltraThon Insect Repellent - 34 Percent DEET - 2 fl. oz. -

Get all-day relief from biting insects! Ultrathon is ranked #1 by a leading consumer Magazine!

Active Ingredient: DEET (34.34%)

Made in USA.

Weather and Wind:

  • Time-release formula provides up to 12-hours of protection; resists rain, water splashes and perspiration


  • DEET (N, N-Dimethyl-metatoluamide) is the most effective insect repellent available
  • Active ingredient 34.34% DEET offers a high level of protection against mosquitoes, ticks, flies and other insects
  • Lotion absorbs quickly; features a light outdoor scent
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Review RatingNumber of Reviews
Effective duration time:Up to 12 hours
Primary active ingredient:34.34 % DEET
Volume:2 fluid ounces

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3M UltraThon Insect Repellent - 34 Percent DEET - 2 fl. oz. Reviews:

Positive Reviews:

Buy a lot of it

This is powerful, long lasting, expensive stuff. That being said, I have used other repellants but won't use them anymore.

I've used this in Southeast Asia during the rainy season and also in the Sierra's in California during springtime, the time when the buggers are out and about the most. I've been through hordes of mosquitoes and came out untouched because of this stuff. I can tell you what sets this apart from the others. It lasts a long time. There's a unique formulation that releases the DEET slowly. Maybe 12 hours more or less, but I sometimes forget to re-apply and it still protects, unlike other products that last only 4 hours and reminded by a nice BITE mark. Also, if I happen to miss a spot, mosquitoes don't remind me I missed it like with other products. Back of the legs, triceps, throat, and ears come to mind. And, with other products, there are some big hungry, daring mosquitoes that bite me anyway (huge bite marks) but not with 3m Ultrathon. They seem to hate this stuff with a passion. If they sold it in bigger tubes I'd buy it, even it means spending 20 - 30 dollars on it.

Make sure you slather it on though, I know it costs a lot but don't go sparingly, use a big splotch and you won't be sorry.
Zenderfall at REI on 06/06/2011

Still my favorite for on-skin use

I just wrote a more detailed review for the Natrapel Picaridin.

Bottom line: I still rely on and prefer this 3M Ultrathon for use on my exposed skin. It WORKS. It LASTS. I can use so little of it, I don't smell it or taste it. (The Natrapel spray had an annoying scent and an "aftertaste" when it got absorbed through my skin.)

I repackage the Ultrathon in very tiny bottles and this can last me weeks, as I only use on my face and fingers.

Only con: I have to be careful with the Ultrathon so I don't damage all the synthetic items I have on/around me. (From what I understand, with the minimal amount of DEET I actually have to use, I believe taking acetamenophin is overall "worse" for me.) Been using DEET (sparingly) for years, and so far, no bad "lab" results on liver health. Knock on wood.

My current protection scheme: Sawyer Permthrin-sprayed clothing. Natrapel spray on clothing hot-spots: gloves, shoulders, arms, hips. Ultrathon on exposed skin (face, fingers). Sea-to-Summit headnet when they physically fly into my face, nostrils, eyes, mouth. Yick.
Sierra Lily at REI on 08/08/2011

Works Great!!

As an avid mountain biker in New England I need a bug repellent that will keep the mosquitoes and ticks at bay on a long sweaty ride. I've tried many sprays and lotions and in general lotions stand up to sweat much better than sprays. The key is to rub it in - don't just let it evaporate. The sweat resistance of this stuff is impressive. When the mosquitoes are really bad they will bite me through my clothes leaving the treated exposed flesh untouched proving its effectiveness. However, like any DEET product it only works on mosquitoes and ticks. REI's Jungle Juice Plus had a fly repellent that worked pretty well. Too bad they don't sell it anymore :( AS far as being greasy, sure it is a little (it is water resistant after all) but it comes off with a little water and a dry towel. You should always wipe off any bug repellent off your hands anyway.

The high price means I only use this stuff on long hikes and mountain bike rides. For just lounging around I use a cheaper spray.
woodsguykevin at REI on 10/10/2011


I LOVE this product! I was camping in the U.P. in Michigan and my boyfriend wanted to teach me how to fly fish... I was very nervous about the large population of little buggers in the small rivers. There were so many that the air had a constant buzzing noise... to my relief I rubbed this stuff right on and didn't get bit once!!! It made my whole camping experience that much better! I will never use another bug repellent! A little bit annoyed that the repellent was on my hands and I accidently put a finger in my mouth... ew... and when i washed it off the palm of my hands the little pests started to take interest so I had to apply more... oh well i guess it would be the same with any product though...
outdorsy gal at REI on 02/02/2009

Nice compact size for your backback

Spent 6 days in an adventure camp in Fresno, CA. I could see the mosquitoes and insects flying and crawling about but I didn't get one single bite. I've tried other drugstore type products and have always gotten bitten. I like the compactness of the tube which was nice since it was easy to put into my fanny pack during my hike and other activities. I also purchase the REI 100% juice and applied a small amount of it on top of this product to be double sure to protect me. It worked!! I shared both products with my friends and no one got bit! :o) The only reason I didn't give this a 5* was the price.
elitetraveldeals at REI on 09/09/2009

Ultra Protection

After trying every form of insect repellent in four different stores, I have settled on Ultrathon. It has protected me from black clouds of mosquitoes while kayaking in Alaska, and also prevented ticks on the Appalachian Trail. I can get by with only applying once a day (and I sweat a lot) and the chemicals never seem to bather me. I prefer the cream to the sponge applicator since I feel that it allows my to have a more effective coating, but that's just my preference. It is expensive, but if you are tired of being eaten alive it's perfect. Try it once and you'll never regret it.
Silence Dogood at REI on 04/04/2010

Perfect insect shield in the Amazon!

I applied the 3M Ultrathon Insect Repellent first thing in the morning and it lasted all day. Not a single bug hovered around me. One tried landing on me, but immediately flew away. It only requires a little dab (about the size of a pea) to cover the entire face. Our tour guide recommended applying with the back of the hand, so the DEET wouldn't transfer to any plastics (camera, etc) and melt. I didn't find the smell objectionable at all, strangely it smelled a little like 3M tape. I only got bug bites after I showered for the night, removing the insect repellent.
travelgirl703 at REI on 10/10/2011

Boundary Waters Tested, and Approved.

I love this stuff. The mosquitos in the Boundary Waters can be pretty bad and I put this stuff to the test. I'm not sure how, but it beat the deet.

One particularly nasty night, I had someone else apply Ultrathon on the back of one of my hands, and sprayed "100%" deet on the other hand. I held up both my hands in the firelight and watched as Mosquitos did "fly-by's" on the Ultrathon hand, where some Mosquitos would land directly in the fresh deet on my other hand. Amazing stuff, I wont use anything else.
ChrisMNRocks at REI on 07/07/2010

Very effective

My wife and I went on our honeymoon in Mexico, which included a horseback ride through the jungle. We put this stuff on our exposed skin before heading out along with our sunblock. Within 30 minutes, we were sweating so much that we could see the sunblock bead up on our arms. There were also mosquitoes everywhere. We looked at the people in our group and all had huge stings over their entire bodies, while we were not bitten once.

This is some serious stuff.
chernysh at REI on 05/05/2010

Works Great

I haven't really had any experience with any other DEET product, but I can say that this thing works and works well.
On one backpacking trip, a particularly gargantuan and aggressive swarm of mosquitoes decided it was going to demolish my group and I. Fortunately, I just applied this stuff and they disappeared save for some outliers. I did have to apply it to my clothing (which isn't ideal), but these guys were biting my shoulders through my shirt.
This product works very well.
Science at REI on 03/03/2013

Negative Reviews:

Too sticky to tolerate

I bought this after reading the great reviews, but was disappointed.

The bugs seem to love me no matter what, so I use multiple levels of repellent, including a topical repellent when there is any suspicion of biting things around. I can't say that this is more or less effective than other repellents because I still attracted the mosquitoes and sand flies, as usual. What I can say is that after trying to be patient and defend this product to my husband for a week, I broke down and bought another repellent. I just could NOT handle the sticky feeling this left. I found myself not wanting to bend at the elbows and knees because of that horrible unbending stickiness. I can say that this appeared to last for quite a while - I still had that stickiness hours later, even after a dip (fall) in a lagoon.

In an effort not to waste, I left this behind at the adventure resort, along with paperbacks and a couple of other acquired toiletries to big to bring home in my carry-on.
Adventure-ish Traveller at REI on 05/05/2011

Poor protection against malaria

I bought this to use in rural Haiti because it was the number one recommendation of the Department of Health. It was my hope that this would help curb the appetite of the malaria-carrying mosquitos common there. While I slathered up with this lotion, my colleagues all sprayed OFF! on. At the end of the day, I was the one itching welt-sized mosquito bites, while they had hardly been touched (although one of them already had malaria and therefore wouldn't have a big reaction to the bites). Luckily, the anti-malarial drugs I was on were effective.
ballm at REI on 12/12/2007

Surprised it is rated so well...

I took this product with me for a weekend backcountry backpacking in North Manitou Island and still came home with more mosquito bites than any trip I have ever been on. This hardly repelled anything!! My travel partner on the same trip agreed. All insects seemed un-phased by the "repellent". I wished the whole time I would have forgone the wait and just brought some Deep Woods OFF!!
SmittyMI at REI on 06/06/2011

OK but not Super Repellent

I went through a whole bottle in 3 days in the Uintas of Utah and it seemed like I had to apply it more than I should. I think the REI jungle juice is more effective especially for the price.
rather be fishing at REI on 09/09/2007

Neutral Reviews:

Not my favorite bug repelant

I bought this for a recent trip to Yellowstone. The bugs where not all that fierce, but I was hoping for all day protection when I put it on in the morning. First I found this to be too greasy, I was using hiking poles and my hands where slippery for hours. Then when the bugs came back out in the afternoon I had to put on more product to keep them off me. I wound up using Jungle Juice Plus spray the most and was pretty happy. I won't be using UltraThon again.
JP18 at REI on 06/06/2009