PU, or Polyurethane, is a polymer which is made of organic units which are further joined by urethane links. It is important to note that most of the polyurethanes are thermosetting polymers which do not melt even after heating. There are few polyurethane forms which are used as faux or artificial leather for the construction of different bags, shoes etc.
Polyurethane is a plastic material available with durable feature and bags made of this particular material are also cheaper as compare to bags made of leather. It is also animal friendly and is also washable and quit easy to clean. Bags made of Polyurethane also require less maintenance. Different brands used this particular material in the formation of different bags.