I did hit youtube to see some videos and it appears to be more of a tarp or ground cloth than a proper blanket. It doesn't look like it would be usable for warmth. Just from a couple of quick videos I think it's maybe not waterproof, either. You might want to check out the videos before you order. If you're just looking for a ground cloth or something a tarp would be cheaper, and if you want it for warmth it might not do the job.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman