Feature●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)●+/- 45 Bias Strands are 45 Degrees.Description 1708 HD Fiberglass, (2415) Double Bias with Mat, 5 Patches. Each patch is 9.5" X 12"