Thermacell R4 Mosquito Repellent Refill - 15 ft Odorless Protection, 48 Hours Coverage, 4 Fuel Cartridges & 12 Scent Mats
$21.18
- Quantity:
- 4 Fuel Cartridges/12 Mats
- Species:
- Mosquito, Black Fly, No-See-Ums
- Dispenser Type:
- Mat/Fuel Cartridges
- Scent Type:
- Repellent
- UV Protection:
- None
- Wick Capacity:
- 4 hrs per Mat
- Contains:
- Allethrin
- Effective Distance:
- 15 ft
- Effective Time:
- Up to 48 hrs
- HazAir:
- Yes
- Heat Type:
- Butane
The Thermacell R4 mosquito repellent refill pack is designed for hunters, campers, and anyone who wants to reclaim their outdoor time from bug pressure without resorting to DEET or smoke. This refill set gives you everything needed to keep a 15-foot protection zone active for up to 48 hours—ideal for backcountry hunts, base camps, or evening sits when mosquitoes are at their worst. Unlike sprays and lotions that require reapplication and can interfere with scent control, Thermacell uses a heat-activated, odorless approach that works passively once deployed.
Each R4 refill pack includes four 12-hour fuel cartridges and twelve 4-hour repellent mats, giving you flexibility to run extended sessions or swap out mats as they darken and lose effectiveness. The fuel cartridges power the heating element—no batteries, no cords—while the scent mats release a plant-inspired allethrin formula that repels mosquitoes without perfume, smoke, or open flame. Because the formula is derived from compounds naturally found in plants and has been EPA-reviewed for safety, it's a solid choice for family camps and areas where you want to avoid harsh chemicals.
Thermacell R4 refills are compatible with all fuel-powered Thermacell devices except the Backpacker model, so they work across the brand's full lineup of repellers. The color-change indicator on the mats tells you exactly when to swap in a fresh one, eliminating guesswork. Whether you're glassing from a ridge, manning a duck blind, or sitting around camp after dark, this refill pack keeps the buzzing at bay so you can focus on the hunt or the moment.
Key Features
- 15-foot mosquito protection zone without odor, smoke, or flame
- Up to 48 hours of total coverage per refill pack
- Heat-activated technology—no batteries or cords required
- DEET-free, plant-inspired allethrin formula EPA-tested for safety
- Four 12-hour fuel cartridges and twelve 4-hour repellent mats included
- Color-change indicator shows when mats need replacement
- Compatible with all fuel-powered Thermacell devices (except Backpacker model)
- Environmentally friendly alternative to citronella and chemical sprays
Specifications
| Protection Radius | 15 feet |
| Fuel Cartridges Per Pack | 4 (12-hour duration each) |
| Repellent Mats Per Pack | 12 (4-hour duration each) |
| Total Coverage | Up to 48 hours |
| Active Ingredient | Plant-inspired allethrin |
| Activation Method | Heat-activated |
| Odor Profile | Odorless |
| DEET Content | None |
| Compatibility | All fuel-powered Thermacell repellers except Backpacker |
Frequently Asked Questions
Will Thermacell R4 refills work with my Thermacell device?
Yes, R4 refills are compatible with all fuel-powered Thermacell repellers except the Backpacker model. If you own a fuel-based unit from the brand's standard lineup, these refills will work.
How long does each refill pack last?
The R4 pack includes four 12-hour fuel cartridges and twelve 4-hour repellent mats, providing up to 48 hours of total protection. You can mix and match cartridges and mats based on how long your outdoor session lasts.
Is Thermacell safe to use around family and pets?
Yes. The R4 uses a DEET-free, plant-inspired allethrin formula that has been EPA-tested for safety and effectiveness. There's no smoke, flame, or harsh chemical odor, making it suitable for family camps and pet-friendly settings.
How do I know when to replace the repellent mats?
Each mat has a color-change indicator that darkens as the repellent depletes, signaling when it's time to swap in a fresh one. This takes the guesswork out of maintaining effective protection.
