Rough Tex Knitted nylon is a material for flags that allow them to be used outdoors for heavier use but keep a low wind profile and easy flying in light breezes. The color fastness and bright display makes an impressive display of whatever flag is on display. It is also water resistant and sheds moisture fast helping to prevent mildew and a water logged flag that does not fly well.
Nylon thickness plays a role in durability, too thin and the flag may not last too thick and it may be too heavy to fly in light winds.The range of thicknesses are measured in a gradation used on textiles called denier, the weight of the material. 115D means 115 denier or 115 strands of silk equivalent.