Tarps are where you find them and limited only by ones imagination and the materials they can find or afford.
I have slept many a pleasant night, and a couple of very nervous ones, in tarps made from every material imagined. Poly, plastic, canvas, waterproofed Egyptian cotton bed sheets, sylon, tyvek, even 4 mil 40 gallon contractors trash bags split and duct taped together. I spent a weekend under a shower curtain once and cheated my way through one historic reenactment under a rubberized window drapery liner.
In the service a poncho was the all purpose shelter and I still keep an OD canvas commie block poncho in each vehicle (the Russians still make them out of canvas), as well as a couple of the polytarps Harbor Freight gives away with any purchase if you have a coupon.
When in bear country, a tactical environment or possibility of a sasquatch attack I prefer a tarp for the visibility and open access/escape.
My favorite is a plow point set up because the traditional lean-too has never worked out well for me if there was any wet or cold weather involved.
https://www.google.com/search?q=tyve...2&ved=0CC0QsAQ
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