Bidirectional fabrics are produced by using high-performance fibers such as carbon, basalt and glass in both warp (0°) and weft (90°) directions in the weaving process. Bidirectional fabrics, also called two-way or biaxial fabrics, usually use fibers of the same size in the weft and warp directions to produce plain, twill 2x2, twill 4x4, 4/1 sateen and 7/1 sateen patterns.