Kodi nsalu ya UD yovala ma vest osalowa zipolopolo ndi chiyani?

Nsalu ya UD (Unidirectional) ndi mtundu wa ulusi wamphamvu kwambiri pomwe ulusi wonse umayikidwa mbali imodzi. Umayikidwa mu mawonekedwe opingasa (0° ndi 90°) kuti ukhale wolimba kwambiri komanso wopepuka.