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Different materials are combined either to improve the material for example: denim and elastine are combined so that the jeans will have a better fitting and can adjust to the the body. But not only that, materials are combined to make the material stronger or longer lasting; another example is socks 100% wool is good but they don't last long and damage easily, but if you mix 50% wool and 50% cotton the will last longer and they are cheaper.

What else can I help you with?