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If it is cotton I would not use it. I don't think that cotton would not be suitable for any outdoor gear - once it gets wet it'll stay wet for days. I've made the mistake of wearing cotton...

here's a short comparison of nylon and polyester:

http://www.sternandstern.com/polyesterfibersandfabrics.asp

Does any think that either would be better for hammock gear than the other?

I...

yes - what we need is a hammock forums fabric expert. I have purchased three rolls of material from Walmart. The first was already discussed in another thread and someone else who bought similar...