Ko te poraka ohorere he momo hua polyurethane me te elasticity teitei me te uaua teitei, no nga taputapu whakarereke waka.Ka whakamahia ki te whakauru ki te puna porowhita o te punaha whakatārewatanga o te motuka, ko te nuinga o te mahi ki te aukati me te ruuma o te ru me te tiaki i te motuka.
He whakamohoatanga hou mo te puehu me te anti-pakeke, te roa o te ora me te teitei o te pāmahana, he mea hanga mai i te polyurethane, te mau atete, te kaha tensile, te parenga roimata, te kaha teitei me te aukati i te whakakoi Te pumau o te waka.