Double Biaxial and Double Bias Fabrics are "non-wovens". These consists of two layers that are stitched together. Using both Biaxial and Bias fiberglass consumes less resin and results in Higher Fiber Content (More Strength) 0/90 Biax Strands are Straight and 90 Degree May be rolled and folded. This does NOT harm the product. Folding is common in production. 1808 Fiberglass, Double Biaxial with Mat, 7" x 540" (15 Yards Long)