The intent of this book is to give a complete overview of the present state of the art of flexible barrier materials such as textile, paper and leather, including methods for barrier evaluation. It will be of interest to readers in industries, consumers, and members of the scientific community. The scope of the field is clearly delineated here for the first time, and it deals with a number of specific topics such as barrier to fire, antibacterial properties, resistance to waves (electrostatic, electromagnetic, acoustics), anti-odor, etc. combined with characterization techniques as well as material nanotechnology.