Active ingredient: Cyclized Eucalyptus Citriodora Oil 80g (OLE).
OLE - Contains =64% p-menthane-3,8-diol (PMD), the active compound responsible for repellent effect, unlike common essential oil-based repellent (e.g. lemon eucalyptus essential oil) patches which contain only 1-2% of PMD.
Approved for use in mosquito/insect repellent by health agencies eg: US Environmental Protection Agency (EPA).