The word "function" originates from Japan, so it is understandable that functional textiles began in various chemical fiber factories in Japan. In the early days, it was emphasized that new materials produce new functions, often first with relevant fiber function technologies, and then looking for new functional applications. What is the "functionality" of textiles? The most incisive "functional" design is multi-faceted. Functions are related to people themselves and their living environment, including comfortable and healthy functions, leisure and sports functions, safety and protection functions. Contains medical and physiological functions.