The Finer Details For an adapted and specialized version of the signature CloudTec® technology, On left nothing up to chance. Using Finite Element Analysis (FEA), On simulated how each component of our prototype reacts while running. Using invaluable insights from this method, On created the optimal midsole for a seamless weight transfer from heel to toe. It's called CloudTec Phase® and it introduces a new age of cushioning. In CloudTec Phase®, the computer-optimized Clouds seamlessly collapse like dominos when your foot lands. The result? Supreme, enhanced cushioning, and a softer, smoother transfer from heel to toe. On Running Mens Cloudsurfer