This series of reports from WTiN will provide an introduction to the wearable smart textiles market, with a particular focus on sport and fitness and protective application areas. Below, the first part of the report includes a smart textiles definition and market overview including general market drivers as well as key impactful forces for the sport and fitness and protective wear segments. The next sections of this report will cover the key challenges that companies need to address when developing and commercialising wearable smart textiles. It will discuss issues such as the multidisciplinary approach to the development of smart textiles, mass market limited awareness, aspects related to use of big data, data privacy and security, standardisation of smart textiles, and environmental challenges.