HA windsocks are made of high quality industrial fabrics.
The windsock fabrics have been tested for mechanical strength, UV resistance, and even colorfastness. By an independent laboratory. The windsock is constructed to allow good water drainage.

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The taper of the fabric windsock from the throat to the trailing end is designed to cause the windsock to fully extend when exposed to a wind in excess of 15 knots (28 km/hr or 17 mph). The HA windsocks have been proven to withstand high wind speeds. In excess of 145 Km/h or 75 knots (ICAO requirement).