Decide what kind of extensions you want. There are two kinds of extensions: human hair and synthetic hair. Both can be worn 24/7 for months and washed, brushed, straightened and curled while they're in place. There are, however, some distinct differences between the two. *Human hair. Human hair is the most popular type for extensions; it's easy to look after (treat it the way you would your own hair) and essentially undetectable when properly put in place. You don't have to do any special styling to human hair. In fact, it dries with the same natural kink/wave that most people's hair dries with. You can use straightening irons and curling
irons or tongs on human hair and even dye it if you'd like. Human hair is more expensive than synthetic hair and cost can run in the hundreds of dollars. Cost does not always indicate quality; however, so be sure to look and feel carefully.
*Synthetic hair. Synthetic hair holds a style really well--curls made with hot rollers can last for days or a straightened style will stay put, even in rainy weather. Be aware, however, that hot irons can melt and ruin synthetic hair. If you're looking to add thickness, synthetic is a great way to go because it creates more volume. Synthetic hair is also easier on the pocketbook.