Repel
Repel 100 Insect Repellent
Spray · EPA-registered
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Pros
- Maximum-strength 98% DEET, 6 to 8 hours that holds up to heat and sweat, all five claims verified.
- The deep DEET evidence base behind it.
Cons
- Pure DEET feels oily and melts plastics, lenses, and synthetics.
- Overkill for casual use, and not for infants.
The full review
At 98.11% DEET this is about as much active as you can buy, and it sits at the top of our recommended maximum protection tier. The evidence is as definitive as repellent science gets, skin safety reads clean, and all 5 audited claims rate strong, so almost nothing drags it down. Our model puts complete protection at 6 to 8 hours for mosquitoes and a genuine 5 to 7 hours against ticks; the label's "up to 10 hours" counts reduced biting rather than bite-free time, and the real payoff of going this high is durability against sweat and rain. Transparency is unusually strong here because nearly all of the formula is quantified. Note this strength can damage plastics, leather, and synthetics, and it is overkill for casual use.
Scorecard
Expand any pillar to see exactly why it scored what it did.
Effectiveness45%97Mosquitoes: 6–8 h of complete protection. Ticks: 5–7 h of complete protection. Protection times are modeled from the actives, concentration, and format (see methodology). Scored on a saturating curve (each added hour counts less than the last), 65% mosquito / 35% tick, with reasonable confidence.
Mosquitoes: 6–8 h of complete protection. Ticks: 5–7 h of complete protection. Protection times are modeled from the actives, concentration, and format (see methodology). Scored on a saturating curve (each added hour counts less than the last), 65% mosquito / 35% tick, with reasonable confidence.
Evidence & honest claims25%97DEET is backed by definitive published evidence, weighted by how close its concentration is to the studied effective dose (base 85). Of 5 marketing claims audited: 5 strong, 0 moderate, 0 weak, 0 unsupported (+12).
DEET is backed by definitive published evidence, weighted by how close its concentration is to the studied effective dose (base 85). Of 5 marketing claims audited: 5 strong, 0 moderate, 0 weak, 0 unsupported (+12).
Safety15%96From published dermal toxicology (EPA/CIR/IFRA), scaled by each active's concentration against its leave-on limit: no notable sensitization risk; low irritation; moderate aquatic toxicity (−4).
From published dermal toxicology (EPA/CIR/IFRA), scaled by each active's concentration against its leave-on limit: no notable sensitization risk; low irritation; moderate aquatic toxicity (−4).
Transparency15%75This product publishes an ingredient list (+20); discloses 100% of active concentrations (+40); discloses 100% of all ingredient concentrations (+15); inert ingredients are not fully accounted for (0).
This product publishes an ingredient list (+20); discloses 100% of active concentrations (+40); discloses 100% of all ingredient concentrations (+15); inert ingredients are not fully accounted for (0).
Every pillar is scored from published rules. Read how we score.
How long it protects
Complete protection ends when the first bite gets through; partial protection keeps reducing bites as repellency decays. EPA label times are verified; the rest are modeled from the actives, concentration, and format.
Mosquito estimate basis (moderate confidence)
Estimated complete protection time from active ingredient + concentration; the source research used a spray-style formulation, matching this spray (no format adjustment). Partial protection (reduced but real bite suppression) is modeled to extend to ~14 h as repellency decays.
Tick estimate basis (moderate confidence)
Estimated complete protection time from active ingredient + concentration; the source research used a spray-style formulation, matching this spray (no format adjustment). Partial protection (reduced but real bite suppression) is modeled to extend to ~12 h as repellency decays. Ticks only: estimated against Ixodes scapularis (the US Lyme vector). DEET is notably weaker against the lone star tick (Amblyomma americanum) and some dog-tick (Dermacentor) populations, and weaker on ticks than on mosquitoes. Anchors: Burtis 2024 (CDC), 25% DEET held >=97% skin repellency through 6.5 h; Buchel 2015, 20% median tick CPT ~4-4.5 h.
Ingredient disclosure
This product publishes an ingredient list (+20); discloses 100% of active concentrations (+40); discloses 100% of all ingredient concentrations (+15); inert ingredients are not fully accounted for (0).
Only active ingredients are disclosed. The full ingredient list (inerts/carriers) is not published, so this may not be the complete formula.
- DEETActive
Active repellent · 98.11%
Claims audit
What the marketing says, versus what the evidence supports.
“Repels mosquitoes that may transmit the Zika, West Nile, Dengue and Chikungunya viruses”
EfficacyStrongEPA-registered label claim; repellency does not guarantee disease prevention.
“Protects for up to 10 hours against mosquitoes”
DurationStrongConsistent with our complete-protection estimate (~8 h).
“Up to 5 hours of protection against ticks and chiggers”
DurationStrongConsistent with our complete-protection estimate (~7 h).
“For severe conditions — repels mosquitoes, ticks, gnats, biting flies, no-see-ums, chiggers and fleas”
EfficacyStrongEPA-registered pest spectrum.
“DEET 98.11%”
EfficacyStrongActive ingredient concentration confirmed by EPA registration and label.
Safe around dogs & cats?
Worst case from this product’s active ingredients. Do not apply this or any human repellent to your pet.
Mainly from DEET.
Mainly from DEET.
Not veterinary advice. Full guide to repellents around pets →
The label
Ingredients, warnings, and directions from the package label. Read it before you buy.
