Our recent test on our polyester socks after 3 months, versus a nylon sock from a competitor, showed complete fading of the nylon sock in 1 month. Our polyester socks had some fading after 3 months but maintained much of their colour. Polyester is the best fabric for handling the harsh UV rays of the sun and is light enough for wind indication on low winds. For maintaining brightness it’s recommended the windsocks are replaced between 1 year and 18 months. The colours used in the test were our orange, green, red, and yellow socks. The yellow sock below is after 13 months. The nylon sock was originally bright orange.
Polyester - Yellow
Nylon - Orange
Polyester - Orange, Green, Red