HDPE Shade Cloth is typically used when the shade is the primary requirement and waterproof fabric is not necessary. Shade cloth is knitted as opposed to woven like most other fabrics. The fabric is relatively inexpensive and with several manufacturers, there are dozens of colors to choose from.
HIGH DENSITY POLYETHYLENE (HDPE) “SHADE CLOTH”
Here are some of the most reputable manufacturers:
https://www.alnetamericas.com/resources/
http://www.galecommercial.com/en_na/product/commercial-95-340
http://www.monotec.com.au/monotec-370.html
http://polyfabusa.com/shade-products/polytex/