Tensile structures are increasingly used as a means of protection against the weather in publicly used spaces. This is because such structures can span large distances and can be aesthetically pleasing.  Tensile structures are generally supported by some form of compression or bending elements, tensile structures can last for long time, and conform to the same structural codes as concrete and steel construction, and it's more cost effective, there are many different fabrics with various features and benefits to each one, however there are three basic external fabric types most commonly used in tensile fabric structures. External fabrics such as PVC (polyvinyl chloride) coated polyester; silicon coated glass; and Teflon coated glass P.T.F.E. (polytetrafluoroethylene). They have different benefits in terms of cost and durability, PVC coated polyester is the least expensive and has a design life of 15 to 20 years. Silicone coated glass cloth and Teflon coated fabric has a higher tensile strength than PVC coated polyester, but is slightly more brittle all types of fabric can be used if suitably fire retardant. The most commonly used is PVC coated glass cloth due to its easy maintenance and very good fire resistance. Untreated cotton can be used which will burn out in a flash and will not drop hot plastics on anyone below