Generally speaking ordinary outdoor curtains have a life span of 1-2 years. When you are thinking about replacing your outdoor curtains for your patio, gazebo or patio, etc., you will definitely want to purchase a more quality product. Heavy duty outdoor curtains are becoming more and more popular nowadays, but there is no strict definition in the market, people may think that the curtains that the wind can't blow are heavy duty curtains.Snowcity as a high quality heavy duty waterproof outdoor curtains supplier, we define the specification as the curtains with the weight more than 300g/㎡. You can get the following choices.