I've never really understood this desire for shade from a tarp. Laying under a silnylon, silpoly or polyester tarp (no matter the color) is going to be hot as heck in the midday sun. Hanging under a tarp is the last place I'd want to be on a blazing hot day, no matter what the material.
Besides, since you're hanging from trees, the trees themselves usually provide plenty of shade. It's not like a tent that can be placed in the middle of an open field with no shade whatsoever. If, for some reason, you're able to regularly find a place to hang your tarp that has no shade, the tarp is going to rapidly deteriorate from constant exposure to ultraviolet (UV) light. I've owned silnylon, polyester and cuben fiber tarps and I don't see any particular difference in comfort hanging under any of them. If it's hot, it's hot, and no amount of shade will change that.
Maybe I'm just not a midday lounger. I've only taken a midday nap a handful of times in the four years I've owned a cuben fiber tarp, and never once did I think, "Gee, I wish I had more shade."
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