Ua los ntawm cov khoom siv zoo polyurethane, siab zog, ruaj khov thiab ruaj khov.Kev hloov kho tshiab plua plav pov thawj thiab tiv thaiv kev laus, lub neej ntev thiab kub tsis kam, ua los ntawm polyurethane, hnav tsis kam, tensile lub zog, tsim kua muag tsis kam, siab zog thiab compression tsis kam lub tsheb stability.