Silpoly is an excellent choice due to its durability, lower cost vs. other fabrics, and its reliability. Silpoly fabrics are among the most popular within the industry for waterproof tarps and tents. Because Silpoly is relatively cheap compared to other fabrics, you are able to create lightweight and waterproof tarps that rival or even outperform many of the higher-end fabrics used in lightweight backpacking. Silpoly, as the name implies, is a polyester fabric impregnated with silicone. Silpoly fabrics is great for creating a waterproof membrane that can be used for any type of camping shelters like tarps and tents. Or, use Silpoly in ponchos, gear sacks, pack covers, or other applications where durable waterproof/windproof fabric is needed. Other benefits of Silpoly are its heat resistance, resistance to stretching, and longevity with reasonable care.