Cov menyuam yaus txoj siv tawv tsis yog tsuas yog ntsuas -cov qauv ntawm cov neeg laus; es, lawv ua raws li lawv tus kheej sizing logic. Raws li kev tshawb fawb ergonomic, lub duav ncig ntawm cov menyuam yaus hnub nyoog 6 txog 12 xyoos ua raws li qhov tsis yog -linear loj hlob nkhaus, nce los ntawm qhov nruab nrab ntawm 3 mus rau 5 cm ib xyoos ib zaug. Txawm li cas los xij, kev hloov pauv ntawm pob txha pob txha, lub duav qhov siab, thiab qhov chaw tshwj xeeb ntawm daim tiab txhais tau hais tias rau cov menyuam yaus ntawm qhov siab tib yam, qhov kev siv tau zoo rau txoj siv yuav hloov tau li ntawm 8 mus rau 10 cm.
Ib qho zoo tiag tiag -fitting me nyuam txoj siv sia yuav tsum ua kom tau raws li peb lub ntsiab lus tseem ceeb: ib qho kev hloov tau yam tsawg kawg yog 12 cm; ib lub buckle dav tsis ntau tshaj 2.5 cm los tiv thaiv tsis xis nyob cov cim; thiab lub pluaj tuab ntawm 2.0 thiab 2.8 mm los ua kom muaj kev sib npaug ntawm kev hloov pauv thiab kev txhawb nqa. Cov hlua uas nqaim dhau yog qhov yooj yim rau kev swb, thaum cov uas tuab heev yog qhov nyuaj rau xov los ntawm txoj siv hlua; Tsis tas li ntawd, hlau buckles tsis muaj cov npoo npoo ua rau muaj kev pheej hmoo ntawm khawb ntawm daim tawv nqaij. Cov ntsiab lus tshwj xeeb no yog lub hauv paus ua haujlwm uas paub qhov txawv ntawm cov menyuam txoj siv tawv los ntawm cov khoom siv zoo tib yam.
