This tool increases number visiblity during competitions, with reduced clutter and no hindrance to the athlete's movements. Specifically, this tool minimises number plate flapping during the cycling phase, thus improving aerodynamics. TIRACHE is a specific tool for multisports such as triathlon and duathlon. It's often the details that make a difference in highly intense competitions where the athlete must deal with his/her own fatigue first rather than competitors. Very easy to use, TIRACHE can be worn and removed with a few quick movements. This tool also customizes the placing of the competition number in order to meet the needs of all athletes.