I have 2 pairs of spiders, one on poly and one on the dyneema/poly pro blend and I noticed that the dyneema/poly pro blend is harder to slide and move. Not impossible, just more challenging. The good news is that once you've got your length settled, it's not going to move on it's on. I found that when using the spiders with the poly straps, sometimes the straps would slip or slide after routing through the spider, causing it to slide when I sat in the hammock. So, both pros and cons.
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