Trek 20 Insect Repellent Sprayácontains onlyá20 percent DEETáand hence it is suitable for most European and North American destinations where insects are more of a nuisance than a real threat, Ingredients: DEET 20 percent, Isopropanol | Usage guidelines: normal conditions - reapply every 4 hours - typically, one 100ml bottle can provide protection for one person for 2 weeks.