ThermaCELL Therm Mat Only Refill 48hrs. This First Aid Accessories developed by ThermaCELL is both scent-free and DEET-free for a safe solution to keeping those pesky bugs away while you enjoy the outdoors. Inside a Thermacell 48 Hours Mat-Only Refill you'll find the active ingredient Allethrin a synthetic version of a natural repellent found in chrysanthemum flowers. With 12 repellent mats lasting 4 hours each you'll have plenty of time to enjoy pest-free outdoor activities. Use a Thermacell Backpacker Mat-Only Refill to keep mosquitoes at bay while you party on. Specifications for Thermacell Mat Only Refill - 48 Hours: Manufacturer: ThermaCELL Weight: 0.8 lb Quantity: 12 mats 4 hours each Insect Repellent: Yes Active Ingredient: Allethrin Model: 48 Hours Features of Thermacell Mat Only Refill: Includes 48 hours of mosquito protection refills Mat-only refill for use in the Thermacell Backpacker Mosquito Repeller No spray and no mess. Scent-free and DEET-free Active ingredient is Allethrin a synthetic version of a naturally occurring repellent found in chrysanthemum flowers Package contains: 12 repellent mats lasting 4 hours each Package Contents: Thermacell Mat Only Refill - 48 Hours Thermacell Mat Only Refill 48 Hours