Windsocks are designed to be noticeable. Most windsocks are the color they are so they are visible. Bright orange, yellow and other neon colors are easily seen from great distances and in harsh weather such as fog, heavy rains and dust storms. Stripes on a windsock serve a dual purpose. The neon and white alternating pattern allows the windsock to be visible and noticeable. More importantly, the stripes tell you the windspeed. Depending upon how much of the windsock is inflated (to what stripe), a pilot or viewer can determine what the windspeed is on the ground in the area. Check out this diagram here to get a clearer understanding.