To protect yourself with a barrier this summer from insects, the ThermaCELL repellent is perfect for all of your needs. When heated in any ThermaCELL appliance, the ThermaCELL Mosquito Repellent Refill effectively repels mosquitoes, black flies, no-see ums & sand flies with a scent that lingers continuously for up to four hours per mat. The repellent, allethrin, is a synthetic analog (chemical copy) of a naturally occurring insecticide, pyrethrin, found in the pyrethrum flower, a member of the chrysanthemum family.
