Shade sails are in essence a big sail and when the strong winter winds arrive they put an extra load onto the sail and the fixing points and just like a yacht will try and move! We recommend you take down your sails in winter to avoid any chance of them blowing away. Having said that not all shade sails are equal. A properly engineered and fabricated sail should be able to handle most winds up to 80kms an hour. We suggest you monitor your sail when strong winds are forecast and test them for yourself. This way you will know what your particular sail will handle.