Yenziwe ngezinto ezikumgangatho ophezulu we-polyurethane, amandla aphezulu, omelele kwaye ahlala ixesha elide.Ukuphuculwa okutsha kothuli kunye nokuchasana nokuguga, ubomi obude kunye nokumelana nokushisa okuphezulu, okwenziwe nge-polyurethane, ukuxhathisa ukunxiba, amandla okuqina, ukuxhathisa ukukrazula, amandla aphezulu kunye nokunyanzeliswa koxinzelelo Uzinzo lwesithuthi.