I don't know. I can tell you the fabric is very thick and the shade looks to be well made, stitching, etc...

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ShadeMart 16' x 20' Sand Sun Shade Sail Rectangle Canopy Fabric Cloth Screen, Water Permeable & UV Resistant, Heavy Duty, Carport Patio Outdoor - (We Customize Size)

Q: For a 16 x 20 what size is best for wooden posts? 4x4?

I would not use a wooden post. My son had a small 8x8 attached from his house to 4x6 poles and they bowed after they dried out. Use a steel pole if you can. You can use what ever you want but expect the wood poles to bend.

4.4/5

Product ID: 418031946

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ShadeMart 16' x 20' Sand Sun Shade Sail Rectangle Canopy Fabric Cloth Screen, Water Permeable & UV Resistant, Heavy Duty, Carport Patio Outdoor - (We Customize Size)