This formula releases DEET over a longer period of time extending the duration of its effectiveness. It is non-greasy, has no alcohol, and is odorless. One application of Controlled Release formula can be effective for up to 11 hours against mosquitoes (including the transmitter of West Nile Virus).Included:1 4 oz bottle of Sawyer Controlled Release Insect Repellent lotionFull Description:Odorless, non-greasy, and sweat resistant, Sawyer Premium Family Insect Repellent Controlled Release is effective against ticks and all mosquitoes.This family-friendly 20 percent DEET formula significantly reduces the rate of DEET absorption by 67% per application, and it extends the duration of its effectiveness up to 11 hours. Comfortable for use in the backcountry or in the backyard, this EPA-approved formula controls DEET exposure by encapsulating DEET in a protein that dissolves slowly, releasing the DEET over a longer period of time. It&';s designed to be compatible with the use of sunscreen, and it can be used in conjunction with Sawyer Permethrin insect repellent clothing treatment for double protection.