Jira risina kurukwa rakagadzirwa nepolyester (polyester fiber). Huremu hwaro hunowanzova pakati pemagiramu makumi matanhatu nemakumi maviri pa square mita, uye ukobvu hwaro hunenge mamirimita 0.3 kusvika 0.7 kuti rive nechokwadi chekuti haritsve uye kuti harisi kupiswa.
