Cov khoom no yog ua los ntawm cov khoom zoo, siab-stretch kho mob ntaub, ib-daim tsim, ua tiav cov nyhuv.Buckles tsim, yooj yim rau muab tso rau thiab tshem tawm, qib ntawm elasticity tuaj yeem hloov kho.Kev siv cov pob txha pob txha hip tiv thaiv tsis yob ntawm ntug, thaum ua si lub luag haujlwm ntawm lub duav lifting crotch, hip tiv thaiv nyhuv yog pom tseeb heev.Ntau qhov ntau thiab tsawg muaj rau xaiv, nyiam dua.