PU skin weft is made by hand-knitted to very thin and transparent PU (Poly-urethan coating) with 100% human hair. The individual strand is tied by hand instead of machine. PU refers to the type of material that hair strands are tied onto. PU material is a thin gauze-like, nearly transparent material. It is more natural skin look and totally undetectable Skin weft is new technology, end user need not go to beauty shop to install this in hair. They can do on their own. They need to peel off the tape and stick in hair line. Thats it. Tapes need to be changed very 3 months. Extra tapes are supplied.