ʻO ka ʻili PU, a i ʻole ka ʻili polyurethane, he ʻili kūlohelohe i hana ʻia me ka polymer thermoplastic i hoʻohana ʻia no ka hana ʻana i nā lako a i ʻole nā kāmaʻa.ʻO 100% PU ʻili he mea hana maoli a manaʻo ʻia he vegan.Aia kekahi mau ʻano ʻili PU i kapa ʻia he ʻili bicast i loaʻa ka ʻili maoli akā he uhi polyurethane ma luna.Lawe kēia ʻano ʻili PU i ka ʻāpana fibrous o ka ʻili pipi i koe mai ka hana ʻana i ka ʻili maoli a kau i kahi papa polyurethane ma luna.Eia naʻe, ua lilo ka ʻili PU i mea kaulana loa i nā makahiki he 20-30 i hala iho nei i loko o nā lako, nā ʻeke, nā ʻeke lima, nā kāmaʻa, a me nā mea ʻē aʻe.