The Noosa TRI 15 is comfortable and ideal for a smooth running experience. It is lightweight, so you don't have to compromise on speed during your training or a triathlon. The Flytefoam technology is lightweight and provides ample comfort without weighing you down. Additionally, the comfortable upper design makes it easier to put on and take off during the various stages of a triathlon. The high upward curve at the front of the shoe helps you propel forward and increase your speed during running.