Nsalu iyi ili ndi mawonekedwe oteteza, omasuka, kuloleza chinyezi.
Imatha kulepheretsa kulowa kwa madzi, magazi, mowa ndi zakumwa zina, ndi kalasi 4 kapena kupitilira kwa hydrophobicity, kuti isayipitse zovala ndi thupi la munthu. Pewani kufalitsa kachilomboka kwa ogwira ntchito zamankhwala ndi magazi a wodwalayo, madzi amthupi ndi zotsekemera zina panthawiyi.
Kaya ndi SARS kapena chibayo cha coronavirus, zovala zoteteza kuchipatala zimathandiza pakufalikira kwa kachilomboka, ndipo zovala zoteteza kuchipatala zikukula pang'onopang'ono ndi luso laukadaulo. Monga zinthu za zovala zoteteza, mtundu wa nsalu ndikofunikira, chifukwa chake timaganizira za mtundu wazogulitsa.
Nsalu yanga imatha kufikiridwa ndi anti-static komanso class 4 yoteteza. Zogulitsa zanga zitha kugwiritsidwa ntchito pazovala zambiri zoteteza, mwachitsanzoGB19082-2009, N14126, EN 13795 etc.