The SOL Escape Bivvy is a different material to their smallest, lightest bivvy bag, the Emergency Bivvy http://www.adventuremedicalkits.com/...al.html?cat=39
The Emergency Bivvy is a non-breatheable mylar, same as your typical survival blanket, although slightly thicker, I think. If you puncture or tear that, it'll fall apart faster than you can say "fuck, where's the tape?"
The Escape Bivvy (the one I use), is a different fabric. It's bulkier, breathable, and appears like it would last a fair bit longer. It seems to be two or three ply, and has some rip-stop grid in it to stop any holes or tears from spreading.
Inside of bag:
Outside of bag:
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