Sorry for your lose, i dont think any fabric out there for tarps is made to drag across sharp branches and bark but my 1.1 silpoly Winter Dream has been caught by the wind like that before and survived without a scratch.
It's ok to try and find ways to lighten your load but 1.1 is as low as i'll go for something as impotant as my tarp, never really understood why someone would want cuban , most of the time spent worrying if a branch will fall thru it and it being almost see thru is a negative for me as well.As far as the membrane goes, this is the first time i've heard of it failing so fast, good luck on your next one.
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