Human hair extensions are the best type of hair extension. 100% real human hair can be used in a hair extensions, it’s biggest advantage is that it can be treated exactly like the rest of your hair. That means you can style it with tongs and crimps or use a straightener just like “normal”
hair.  The only thing you have to be aware of is that too much heat can really dry out human hair extensions and cause them to become brittle and matted, so prior to applying heat it is best to spray the hair extension with a conditioning lotion, to keep the moisture in the hair rather than dry it out.  This also helps to keep the hair extension looking healthy and shiny. To prevent your human hair extensions from becoming matted apply conditioner to it regularly.