The auxetic fibres have great potential to be used in fibre reinforced composites. Unlike conventional fibre and matrix material which undergo lateral contraction in both the matrix and fibrous materials during axial loading, leading to failure at the fibre-matrix interface, auxetic fibres could maintain this interface at higher tensile loads provided that the radial expansion of the auxetic fibres to the radial contraction of the conventional matrix is carefully matched. Nevertheless, other mechanical properties like, strength and very high modulus are essential in order to replace conventional fibres with auxetic fibres in these and other applications. More advanced work is required in order to increase the range of the materials that can be finished in auxetic fibre form together with the development of predictive models to understand the deformation mechanisms leading to auxetic behavior in fibres.