Natural fiber hybrid composites are substances containing different fibers. They are made of polymer matrix and at least two fillers, where at least one filler is natural fiber. Properties of a composite depend on properties of each component and interactions between them. Purpose for the use of natural fibers are their great mechanical properties, accessibility, price, low density, environmental friendliness, and they do not release harmful substances during processing, that can damage the equipment used. Natural fibers also have some weaknesses, such as bad thermal stability, flammability, water absorption, sensitivity to UV light, germs and molds. There are a few ways to void these. Firstly, we can additionally process natural fibers to improve their properties and matrix bonding. Secondly, we can add more fillers to the composite. The additional filler lessens the weaknesses of the natural filler. That way we can make composites with properties close to the wanted ones and enable their use for a certain application.