Renkasa Umbrella Concept by Kam Leang. After in depth research on the kind of raw materials employed, its assembly, and distribution, Kam designed contemporary umbrella, called Renkasa. As with traditional umbrellas, it is impossible to recycle the same. In simple fact, there were several obvious reasons for a large number of umbrellas being thrown away in Tokyo. In order to overcome such situation, Kam has come up together with an exclusive umbrella design.