Denim is a reasonably priced cotton fabric, yet the quality may add years to the life of your jeans. The most expensive jeans are constructed of high-quality cotton, whilst low-cost ones frequently employ a synthetic blend. Finally, costly trousers are usually associated with ethical manufacture. You can't say that about their cheaper counterparts. The cost of making a pair of jeans starts with the grain of the wood used for the frame of the pant leg. Then there's the fact that you need a certain amount of thread to sew the various parts together. Last, but not least, there's the actual manufacturing process required to produce the final product. In short, cheap jeans are mass-manufactured using substandard materials that lack durability and longevity. They're also less safe because they tend to be tighter fitting which increases the risk of injury if you fall. Better still, buy original jeans that were designed by famous brands such as Levis, Fred Segal or True Religion and you'll have something special that will last for decades.