Isingeniso: Njengengxenye ebalulekile yemboni yezindwangu, ukukhiqizwa kwesikhumba sokwenziwa kudlala indima ebalulekile ekwenzeni imikhiqizo ehlukahlukene, kufaka phakathi izicathulo. I-PU (Polyurethane) iyinto ethandwayo esetshenziselwa ukudala izicathulo ezingaphezulu ngenxa yezakhiwo zayo ezinhle kakhulu. Kule ndatshana, sizohlola emhlabeni wezicathulo ze-PU futhi sihlole ukubaluleka kwayo. 1. Yini i-PU Shoe