Mu gihe utegura ibirori byo hanze, gukomeza kunywa bikonje bishobora kugorana, cyane cyane mu gihe ushyushye. Indobo ya EVA ishobora kwimuka nigisubizo cyiza gitanga uburyo bufatika gusa ahubwo n'uburyo. Yakozwe muri EVA yo mu rwego rwo hejuru (ethylene-vinyl acetate), izo ndobo zirabura ni zoroheje, zirambye, kandi yagenewe guhangana nibihe bitandukanye byo hanze. Imiterere yabo ishobora gutwara