Our heavy-duty 10-ounce gold canvas tarps are made with single-filled military-grade natural cotton duck fabric that is both durable and highly breathable. The mildew-resistant tarps are treated with water-repellent paraffin for water resistance - however these canvas tarps are made with 100 percent cotton fabric and are not waterproof. Since the paraffin is made of petroleum byproducts, it leaves a strong odor, so we don't recommend using these tarps indoors. The odor will dissipate as the material is exposed to outside air. The gold canvas tarps feature double-stitched hems and seams as well as triple-thick hems for maximum durability. The fabric also helps reduce wind and condensation. They aren't strong enough for use as trailer tarps, and we don't recommend using them as car or boat covers because they are made with a colored dye and water-proofing wax that may rub off and stain painted surfaces. Since our canvas tarps are made with 100 percent cotton fibers, the fabric will shrink over time. The amount of shrinkage is dependent on environmental conditions, such as a weather, sun exposure and humidity. These tarps are made to order and take up to between 15 and 20 business days before shipping. Please read our custom tarp policy before placing your order.