Sawyer's Controlled Release Insect Repellents use a patented Sub Micron Encapsulation process by which DEET is captured inside a Micale protein. As shown in the diagram below, each microscopic particle of protein contains chambers which hold the DEET. Over a period of up to 24 hours your skin slowly dissolves the protein particles. As the particles are dissolved, DEET is released from the chambers for evaporation (the function which keeps the bugs away). At any point in time you may simply wash the remaining formula off your skin with soap and water.
In the Controlled Release formula virtually all of the DEET remains in chambers until it is released and only very minimal amounts of DEET are ever on the skin at any one time for possible absorption. In traditional repellents all of the DEET is present directly on the skin until it evaporates, hence much more is absorbed. Because the protein is formed into small particles, we can nestle them into the skin similar to those techniques used in the most advanced sun blocks. With this technique, Sawyer Controlled Release insect repellent provides some of the benefits of the best sun blocks such as significant water resistance, a non-alcohol, non-greasy dry feel, and long lasting protection.