You've probably seen people jogging the streets barefoot, or maybe read the book Born to Run, which takes a close look at the podiatric health of barefoot cultures. The barefoot concept embraces the philosophy that you'll perform better if you allow your foot to do its work unencumbered. While you can't actually wade a river barefoot, the premise behind the Simms G4 Boa Boot ($240, simmsfishing.com) is that your foot is a complex appendage with tiny bones, ligaments, tendons, muscles, and nerves all working to keep you balanced and moving. If you eliminate feedback coming from the river bottom, you hinder your own ability for proprioception—the ability to sense the orientation and movement of the body and its parts. According to Brandon Hill of Simms, the key to the new boot is the sculpted TPU retention plate in the boot platform that allows the outsole to articulate so you can feel your way along the river bottom better, and use your foot the way it was designed.
For more information, see the video below.