Lifesystems DEET-Free Midge Repellent uses the active ingredient Saltidin to provide increased protection from midges and smaller biting insects for up to 8 hours after application.__ The 20% Saltidin based formulation offers medium-high level protection against biting insects, and is more suited for sensitive skin than DEET based repellents.Suitable for use on children over 2 years of ageContains Saltidin - medium-high level protectionDEET free formula offers up to 8 hours protectionDurable aluminium bottle with pump-spray topRepellent will last 24 months from when it is first opened