The current book is concerned with one of the most important subjects in the materials science-how to utilize natural fibers as the enforcement in composite materials that can be substituted for existing metallic and plastic parts as well as help solve the environmental problem presented by the increasing amount of agriculture residual. The book consists of eight chapters describing the nature of natural fibers, their mechanical proper- ties and applications, as well as how to design natural fiber composites, how to choose the suitable material for a design and method of manufac- turing, and finally how to test methods on the natural fibers, textile prod- ucts, matrix and the composite.