Grundens Harvestor 17 Bib. FABRIC: For professionals who prefer a woven synthetic base fabric- we developed the Harvestor. Abrasion and tear resistant the Harvestor fits your needs. A woven polyester base fabric (3.76 oz. per yard) with PVC applied to both sides (15.5 oz. per yard) for a total weight of 19.24 oz. per yard. This heavy duty fabric is strong- long wearing and mildew resistant.