This is a Great Thicker  Polyester Canvas.  These are strong fibers woven through out the material with no PVC fillers makeing it a solid poleyester canvas with a urathane coating on the underside of the material protecting the fibers. While most add a fleece lining to there order on the canvas type materials as a two cover system this fiber tends to be smooth enough to the touch and many opt out of the fleece saving a little money on that part while being happy with the texture of this type of material on their car. ( we always recommend considering a two cover system as a fleece will protect the cars paint to a much greater degree.)
Polyester fibers start out as a liquid acrylic polymer solution. When  “stock” fabrics are made, the fibers are dipped into a vat of dye.  The outer surface of the fibers are colored. The method produces a great color, These top quality fibers are coated with eurothane preventing  degrading and are made to last outside, be tow-able and or withstand high winds and or the corrosive nature of the outdoor elements.

This is a Great Material.  Its a thicker weight dyed canvas that lasts much longer,  The individual fibers are stronger than other canvas materials.  This material is made NOT to disappoint.