1. Ko etahi atu waahanga he anti-waikura me te aukati i te waikura, ka taea te urutau ki te taiao mahi kino, a ka taea e te oranga ratonga te tae ki te 20 tau.
2. Ko te weft o te kupenga whatu e mau ana i te hangarau hurihuri, e whakanui ana i te elasticity me te mahi cushioning, a ka taea ki te urutau ki te deformation o te roha waiariki me te whakahekenga, kia mau tonu te taiapa kupenga i te āhua kikī.
3. He hanganga ngawari, he watea te tiaki, he wa hanga poto, he iti te rahi me te taimaha marama, hewari ki te kawe me te whakauru.