Expedition 100 range contains a dual action formula which combines natural pyrethroids with deet to provide the maximum level of protection against biting insects in all environments the natural pyrethroids act as a bite inhibitor discouraging biting each application of expedition 100 will last for over 10 hours re application might be required in areas with high temperature and humidity product features 95 deet maximum level protection dual action formula offers over 10 hours pro