Although cheaper than human hair,synthetic pieces don’t last very long. The cheapest synthetic hair cannot withstand heat . Flat irons,curling irons, or hot rollers used on it will most likely melt the fibers. There are, however, some kinds of synthetic fiber Monofiber, Thermofiber that can withstand heat to a certain degree. Brandy’s line of synthetic hair,Pro-10 is one such brand.
And even with synthetic hair that you can heat style,the heat has to be kinda low.Use detangling spray on the synthetic hair daily. This will stop the hair tangling and keep it from getting frizzy. Also, use an appropriate comb or brush designed for use with extensions; normal combs and brushes can damage the wefts and cause them to loosen or come out.