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The hair strand is made up of 3 layers which are the cuticle (most outer layer), cortex( next layer), and medulla( middle layer). When it comes to weaves/hair extensions what is most important to know is that the hair strand is not getting any natural oils in order for the hair to maintain its strength, luster, and health. Therefore we must protect and treat it ourselves.Most importantly ensuring we maintain the cuticles which is the most outer layer of the hair, which protects each hair strand. This is very vital in maintaining hair extensions.