During the development phase of a project, listening to the opinions of the experts can turn out to be very useful. In order to create this veritable working tool, we got into the field and listened to the various operational needs of the professionals. The word was ergonomics. This was the focal point of our design. By studying hand movements during the styling phases, we created a linear and tapered hair irons which is small, manageable and adaptable to various types of jobs (smooth hairdos or naturally wavy) with advanced technical features.