Fiberlay Orca Knit Mat, +/- 45 degree weave, 17 oz, 38", Sold by the yard. ORCA Double Bias Fabrics are a stitch-bonded composite reinforcement combining equal amounts of continuous fiber oriented in the +45 and -45 degree directions into a single fabric. This construction offers off-axis reinforcement without the need to rotate other materials on a bias. The versatile fabric, made from high-quality fibers, is available in a variety of widths and weights to meet your particular requirements.