This DEET insect repellent - Expedition 100+ range contains a dual action, high strength formula which combines pyrethrin with DEET to provide the maximum level of protection against biting insects in all environments. The pyrethrin acts as a bite inhibitor, discouraging actual biting. Each application of Expedition 100+ will last for over 10 hours. Re-application may be required in areas with high temperature and humidity.95% DEET and 0.1% Pyrethrin - maximum level protectionDual-action formula offers over 10 hours protectionDurable aluminium bottle with pump-spray topSuitable for children over 6 yearsThe repellent will last 24 months from when it is first opened DEET is proven to be the best repellent against mosquitoes available. This comes in different strengths and the higher the percentage, the more effective it is and the longer it lasts. The most popular strength is 50% DEET but we recommend you get one with a bite inhibitor (PLUS+)