1. Weight - human hair is twice the weight of fiber and facebook besthairbuy therefore feels "heavy" on the head - at its worst, this increased weight and stress on the hair can cause "traction alopecia". In addition, human hair is porous - it soaks up water - which can significantly increase the weight when wet.2. Tangle - human hair tends to "matt" and "tangle" - this is because the surface of human hair has little "spines" on it, that look like roof tiles under a microscope. Because this "alien" hair isn't being conditioned by the besthairbuy facebook natural oils that condition your own hair, these "spines" tend to "stick out" and tangle up with the other hairs on your head. Consequently, you do need to use quite intensive conditioners to keep the hair in good condition. Fiber, however, has a smooth surface and therefore is less likely to tangle.3. Glue - human hair extensions are typically applied with glue and removed with acetone - a recipe for damage, the results of which we regularly see in our studio. Our method doesn't use any chemicals.