or http://www.topendsports.com/testing/tests/hydration-sweat-patches.htm
@hippy started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
or http://www.topendsports.com/testing/tests/hydration-sweat-patches.htm