X-Bionic and exploited the concept of controlling sweat to take advantage of it enhancing energy on your run. The X-Bionic Energizer Summerlight features mild compression, distributes the sweat precisely where it belongs, namely, over a wide surface and directly on the skin. This promotes the body's cooling system to be optimised, resulting in the runner utilising less energy for temperature regulation, and thus performance ability increases. If there is no sweat being produced, the action changes. Insulating air is stored and the systems serves to warm. Lighter than its big brother, the Bionic Energizer, it still offers the same technology: Cools when you sweat, and warms when you freeze.