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How long (in terms of actual use) do 3000HH polyester flysheets tend to last.

Our favourite tent is our HiGear Gobi (plus Hypercamp tarp). Have used it for 2 years during which it has been pitched 12 times and up for about 60 nights in total. A variety of conditions - wind and rain to 40 plus degrees in Southern France. It has done us proud but on last outing for this year I noticed 2 holes (each about 10mm across) in the flysheet. There is no 'flap' of fabric left - almost as though a polyester eating moth has taken a nibble. I have successfully patched them but am wondering if the flysheet is starting to break down and I need to buy another Gobi next time GO have them on offer.

What is the experience of others?

Its not the waterproofing (HH) that determines the UV life expectancy of a tent although if the waterproofing is built up by multiple layers it will take more wear of the layers before it starts to leak. It is the denier of polyester used (and possibly any additional UV resilience added) that will determine the life of a tent. A 72-75 denier polyester tent is supposed to last approx 6 months of exposure although some last considerably less and others more. A 100 denier polyester (e.g. in Kampa's Ultimate tent range) will last double if not longer.