Remi hair is extension hair in which all the cuticles are pointing, or facing in the same direction. When hair is processed for extensions, the root to end direction of individual hairs can get reversed. Some hairs run root to end, along with hair that is end to root. More expensive hair leaves all hairs running root to end. Cheaper hair does not. This hair might seem soft to the touch, but when shampooed is when the difference between Remi and non-Remi hair will bring itself to light.The cuticles of the reversed hair can actually get caught on one another.  The rubbing of these cuticles together causes the hair to tangle.