PU jira ndeye polyurethane, inonyanya kugadzirwa neyepamusoro elastic fiber composite, ine hunhu hwakafanana nedehwe chairo, pu jira regidhi rakachipa, chiyero chekushandisa chakakwira.Nekuda kwechiedza chakazara chejira repu, inogona kuve yakanaka kwazvo kudzivirira kukuvadzwa kwemvura, uye kutora kwayo mvura kunonyanya kunaka.Mushure mekutora mvura, hapazovi nekuzvimba kana deformation.Panguva imwecheteyo, zvakanyanya nyore kutarisira.Sematehwe, kunhuwa kunenge kwakareruka uye mutengo wacho haugoneki.