Back to top

Please select a color/size.


  • Time-release formula provides up to 12-hours of protection; resists rain, water splashes and perspiration
  • Active ingredient 34.34% DEET offers a high level of protection against mosquitoes, ticks, flies and other insects
  • DEET (N, N-Dimethyl-metatoluamide) is the most effective insect repellent available
  • Lotion absorbs quickly; features a light outdoor scent

Made in USA.

Active Ingredient: DEET (34.34%)

View all Ultrathon DEET-based Insect Repellent

REI membership


Best Use Backpacking, Camping, Hiking
Active Ingredient(s) 34.34 % DEET
Effective Duration Time Up to 12 hours
Volume 2 fluid ounces
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 516ms
  • bvseo-msg: Execution timed out, exceeded 500ms;

Can you apply sunscreen below or on top of this? Approximately how many applications does 2 Oz. last? I plan to treat my clothes (long sleeve and long pants) with Permethrin so I assume I would only need to apply this to my hands, ankles, face and neck.

Asked by: EL123
Yes, you can put sunscreen on top of the UltraThon Insect Repellent. The CDC recommends applying sunscreen first and then the repellent. Once applied, the UltraThon will provide 12 hours of protection.
Answered by: REIservice
Date published: 2017-06-02

what is the expiration expectancy for a bottle? Planning on traveling SE Asia for 6 months, will this expire during the duration of my trip?

Asked by: laura
​This lotion is stable up to 5 years from date of manufacture.
Answered by: REIservice
Date published: 2017-06-06

Planning a trip to the Caribbean in need a serious repellent that will last. There will be beaches and pools, and I need the most " water proof " long lasting product out there. Between water and sunscreen how often does this product allow application ? 

Asked by: beth e
3M states that UltraThon will provide 12 hours of protection. UltraThon resists rain, water splashes and perspiration. If you go fow a swim in the pool or ocean, you will want to reapply after drying off. When it comes to using insect repellent with sunscreen, 3M states the following: "Sunscreens and insect repellents may be used together on exposed skin. However, there is some evidence that DEET can reduce the efficacy of sunscreen when applied to the same area. One study showed as much as a 33% decrease in sun protection (SPF) when a 33% DEET lotion was simultaneously applied. Therefore, when applying both DEET repellent and a sunscreen, you will need to reapply the sunscreen more frequently to prevent sunburning."
Answered by: REIservice
Date published: 2017-06-09

A couple of years ago I bought this product with an applicator built into the tube. I thought this was a good feature because it allowed me to keep from getting Deet all over my fingers. Does that product no long exist? Any idea why it is gone?

Asked by: Msjgrant
Ultrathon is available in a lotion, aerosol, or pump spray, but we only offer the lotion. If you are looking for a different application, we recommend inquiring with the vendor, 3M, on how to purchase.
Answered by: REIservice
Date published: 2017-05-26
  • y_2017, m_6, d_23, h_16CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_4
  • loc_en_US, sid_686229, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_rei-inc
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 50ms