The lifesystems expedition 100 sprays powerful insect repellent effect provides you with the necessary protection to prevent infections carried by insects a dual action high strength formula which combines the effective repellent action of deet plus a bite inhibitor formulated using natural pyrethroids to stop insects which do land on your skin from biting biting arthropods transmit an array of vector borne pathogens that cause diseases including malaria dengue lyme disease filariasis