I have conducted a survey of some flag manufacturers and they all
agree on one thing: that spun polyester 2 ply is the best material for
your situation. Some of the manufacturers provide the material under
trademarks and they also offer additional and reinforced stitching and
brass grommets for flags in adverse conditions.
This is an example as to what some of them say.
"What is the best material and construction for flags flown year round outdoors?
Outdoor year round flag material and construction: Nylon and polyester
are the most suitable materials for outdoor use. Due to its fade
resistant characteristics, nylon is especially preferred in
environments where there is constant exposure to bright sunlight.
Polyester, a heavier material, is ideal for extreme weather
conditions. Although not as fade-resistant as nylon, it is more likely
to withstand frequent exposure to rain, freezing temperatures, and
This material represents new and improved flag fabric technology. Made
of 100% spun polyester, its 2x2-ply construction combines durability,
strength and fly ability with a rich feel and look. These flags are
ideal for extreme weather conditions without the excess weight. These
are the longest lasting flags on the market today."
"POLYESTER 2: Our most durable flag fabric. Your best choice for high wind areas."
"They are made of tough two ply polyester; the strongest, longest
lasting material developed for maximum durability in unpredictable
weather conditions such as strong wind, intense sun, dust and
moisture. These flags will outlast nylon 2-1 and are excellent for
" "Spun" polyester - a special, premium material that holds up well in
windy or harsh conditions. Because it is spun, it has the feel of
cotton, but its synthetic nature gives it the durability of nylon."
"KORALEX II? represents new and improved flag fabric technology. made
of 100% spun polyester, its 2x2 ply construction combines durability,
strength and flyability with a rich feel and look. These flags are
ideal for extreme weather conditions without the excess weight."
"These 100% Polyester flags are simply put, the most durable longest
lasting flags for outdoor use. TornadoII ® flags are made with strong
2-ply polyester and an open weave construction to lessen wind
resistance and abrasion."
If you wish to view some more comments, use this search term:
polyester flag OR flags material durability OR durable
I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.