look for bonded nylon thread, its stronger then poly and has some stretch to it which is good for gear like saddles because of the material stretching under load (form some article that's related ) . they say its not UV resistant but you can find some that it. at the same time when they refer to outdoor use , they are talking about products that will stay outside for extended periods of time/days exposed to direct sunlight like patio furniture.this will damage the strength of the thread and break it down. for our hunting purposes it will not applies we are outside for hours at a time and during a lot of fall like weather.i noticed a lot of people use both #69 and #92. I use a bonded nylon thread #69 from Cansew that has a 12LB break strength, I ve seen others with 11lb. I feel like its a mater of preference at the end of the day as long as stay within the guideline and do the math proper for SPI.
the link below helped me decide and info from others on saddlehunter also
this link was helpful , snapshot below is from it. https://www.thethreadexchange.com/m...de=TTE&Category_Code=Nylon-Thread-Information
I also used https://www.sailrite.com/How-to-Sew-Webbing-Loops. & https://sewingiscool.com/sewing-nylon-webbing/
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I agree on preference, but given the general choice between bonded nylon and bonded polyester of the same size thread, polyester seems to be the superior choice. Nylon isn't bad, but polyester is better suited for outdoor applications as you observed (UV breakdown, moisture retention). I know our equipment doesn't get the same exposure as patio furniture, but I like the extra insurance.
In high stress applications, it's probably most important to match the thread to your materials; nylon for nylon, polyester for polyester. Based on what I've read from parachuting and rock climbing resources, this seems like something giant research projects could be done on to reach a definitive result, and the choice would still be a tossup. My observations show rock climbers using either one (matching material), and parachute riggers using nylon (the canopy and rigging is nylon).