SPI Nets offers a line of Pro tunnels that can meet any program's budget. Poly tunnels offer all the same features at a fraction of the cost of nylon tunnels. Plus their added UV tolerance, weather, and rot resistance make them ideal for outdoor usage. Though not as tough and resilient as Nylon they more than makeup for it with their lower cost and excellent outdoor performance. Currently available in twine sizes #24, #36, and #42. For more details, you can visit at https :// spinets . net / premium - poly - batting - cage - net . html