Jungle formula maximum strength irf4 roll on is an insect repellent that is specially formulated for visiting long haul and high risk disease places or simply if you need some extra protection if you are prone to bites it contains 50 deet and plant extracts as well as vitamin e to improve effectiveness and feel of the skin this handy and convenient roll on avoids getting the formula on your hands and is ideal for use on smaller areas such as ankles and wrists while providing up to 12 hours