Windsock Information

Reasons for a Windsock

By placing windsocks in noticeable locations, workers become more safety aware when approaching your work site. This also enhances their ability to carry out the Emergency Response effectively. Having windsocks on site helps to conform to regulatory requirements like Occupational Health and Safety (OH&S) guidelines. Regulatory requirements specify “Three Dimensional Wind Direction Indicators”. All our products can be ordered quickly and conveniently via the  “Get A Quote” section of our website!

Manufacturing Information

Using a CO2 laser cutter, all of our socks provide pinpoint accuracy and feature a clean cut and sealed fabric edges. Our method of manufacture ensures the highest level of accuracy and consistency to achieve optimum results on our production line and on custom orders.

Here at the Roc Tan Corporation, we make our windsocks using a 100% polyester material. 100% polyester material will not absorb water and its static electricity properties are of a non-significant level. “Static” electricity appears when two dissimilar insulating materials are placed into intimate contact and then separated. Two of the same materials rubbing together won’t create static electricity. However, if the windsock does rub against a foreign material static electricity could be generated, but the static electricity of polyester is of a non-significant level. This is extremely beneficial because, if your windsock is being used at an industrial site where there is a chance of flammable vapor outflow, a polyester windsock will help minimize potential dangers. Polyester has very low static electricity compared to Nylon.

Additionally, polyester has much better color fastness properties. Therefore, our products retain their color longer and have a high resistance to color fading. Our strong polyester is light weight to provide sensitivity in the slightest of breezes. We have tested materials and dyes in the laboratory to ensure that our mill material gives the best possible color fastness and strength.

Windsocks are available in the following colors:

A swatch of the colors Roc Tan offers: Blue, Corn Yellow, Red, Caution Yellow, Green, Orange, Flame Orange and White.

To further understand windsock colours, please visit our Regulatory colour info page.

What do Windsocks Do?

Windsocks are very basic devices that measure wind direction and provide a rough idea of the wind’s intensity. Windsocks are used to measure wind force, speed, and direction using aerodynamics. Aerodynamic compression is used to fill the sock’s shape and make it noticeable as the wind infiltrates the sock at the large opening and exits through the smaller end. As the tube narrows, wind speed and pressure is increased causing the windsock to stick straight out. The more forceful and fast the wind is, the straighter and more filled the windsock. Wind direction is demonstrated by which way the windsock is blowing. The hoop holding the windsock can rotate when the wind changes direction, so the direction of the windsock will indicate that of the wind.


The main function of the hoop is to keep the sock open, so wind can blow through it. The other part is the swivel ability or rotation of the hoop. This swivel unit is mounted on the pole. When the wind changes direction, it allows the sock to swing around and open into the wind.

An extension on the back of the hoop helps the hoop (frame or harness) to swivel into the wind. Slight breezes easily rotate the hoop into the wind when the sock is preloaded or held partially open with an extended cage. A preloaded windsock works like a weather vane in slight breezes.

Caution yellow windsock on dangerous work site.


An extension on the back of the hoop holds the sock out away from the pole which helps prevent the sock from wrapping around the pole. One of the main reasons a sock wraps around the pole is because the swiveling system is stiff and does not easily swivel into slight breezes. If the hoop does not swivel into the breeze, the end of the sock will tend to wrap around the pole when stronger winds develop and force the hoop to swivel without first filling the sock with wind.

Rotation of the windsock hoop or frame with ease is paramount. The windsock wraps around the pole if the frame does not rotate into the slightest of breezes.

To understand the measurements of windsocks please visit our windsock measurement page.

Red windsock in green field