Many of the commercial hammocks, I am most familiar with HH, have different weight limits for different hammocks made of the exact same material specs. For example the Explorer Deluxe and the Safari Deluxe are both constructed of 210D oxford nylon yet have different weight ratings. Similarly the ULBA and Explorer UL are both constructed of 70D high count nylon but sport different weight ratings. It's a good question and I suspect somewhat more complicated than just the fabric.
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