Below are reference images showing canvas cloth in rolls / yards used for pipe and duct insulation or general industrial applications like protective wrap and covering. These fabrics are usually 100 % cotton plain weave ~6 oz:
Essential plain 6 oz cotton canvas roll for insulation, wrapping or insulation finishing.
Canvas cloth used specifically as a protective barrier over duct and pipe insulation (6 oz canvas with length ~20 yards).
Close‑up weave view of the cotton canvas fabric — breathable and strong.