20' x 30' Heavy-Duty Polyester Canvas Tarps ♦ Does Not Stain ♦ Does Not Have Any Odor ♦ 14.5 oz. Per Square Yrd. ♦ Grommets Every 2 Ft. ♦ Water Proof ♦ Lock Stitched Hems & Seams ♦ Triple Thick Hems ♦ 2X Stronger Than Cotton Canvas •Breathable ♦ Mildew Resistant ♦ Reduces Condensation ♦ Reduces Wind ♦ Tear Resistant ♦ Made In USA