Cov kev tshawb fawb ergonomic qhia tias cov menyuam hnub nyoog 6 txog 15 xyoos tau txais kev loj hlob sai hauv lub duav thiab lub plab ncig thiab koom nrog ntau yam kev ua ub no ntawm lub cev; Yog li ntawd, txoj siv sia ntawm txoj siv sia yuav tsum poob rau hauv 28-32 mm ntau kom zoo sib npaug ntawm kev ruaj ntseg thiab kev nplij siab. Cov hlua khi uas nqaim dhau yuav khawb rau hauv daim tawv nqaij lossis plam tawm ntawm qhov chaw, thaum cov uas dav dhau xav tias tawv thiab tsis yooj yim, cuam tshuam kev txav ntuj xws li khiav thiab dhia thaum lub sijhawm so lossis ua haujlwm squats thaum lub sijhawm kawm lub cev. Los ntawm kev sim ntau yam anthropometric, 30 mm tau raug lees paub raws li "golden width"- nws yog qhov dav txaus los npog cov khoom thauj -cov kabmob thaj tsam ntawm ob sab ntawm lub duav tsis tau khaws cov elasticity txaus, tso cai rau txoj siv kom ncab zoo meej nrog lub cev hloov maj mam txav yam tsis muaj pinching, hloov chaw. Qhov tshwj xeeb qhov ntev no tsis raug xaiv; es, nws yog qhov tshwm sim ntawm kev rov ntsuas dua raws li kev hnav txhua hnub- thiab- kua muag tawm tswv yim ntawm ntau pua tus tub ntxhais kawm theem pib, theem nrab, thiab theem siab, nrog rau kev txheeb xyuas cov ncauj lus kom ntxaws txog kev hloov pauv ntawm lub duav ntawm lub duav.
Rau cov menyuam yaus uas hnav khaub ncaws hauv tsev kawm ntawv txhua hnub, ob peb yam txaus ntshai dua li siv txoj siv sia tam sim ntawd poob qis thiab lawv cov ris tsho hauv qab poob qis -tshwj xeeb tshaj yog thaum sawv ntsug rau kaum feeb thaum tus chij - tsa lub koob tsheej, ua tiav nees nkaum txoj hlua dhia ua si hauv PE, lossis dhia kom caij tsheb npav tom qab tsev kawm ntawv. Ib txoj siv uas muaj peev xwm tiag tiag "ua kom nrawm" yuav tsum muaj qhov sib npaug ntawm elasticity thiab resilience - nws yuav tsum tsis txhob flimsy zoo li cov roj hmab band uas poob nws cov duab tom qab ib tug rub, los yog nruj zoo li ib tug tawv tawv txoj siv uas constricts tus neeg hnav mus rau lub point ntawm breathlessness. Txoj siv sia no muaj lub siab - rov qab elastic webbing ua ke nrog thickened, ntxiv edging ntawm cov pob qij txha; nws qhov nro ib txwm hloov kho rau tus neeg hnav lub duav hloov pauv, thiab qhov sib nrug ntawm qhov buckle tau raug kho kom haum raws li kev loj hlob ntawm cov menyuam yaus, tshem tawm qhov xav tau kev hloov kho tas li. Rau cov tub hluas, nws tsim ib tug zoo huv si, crisp tuck ntawm lub duav rov sauv; rau cov ntxhais, nws zaum flush tiv thaiv cov tiab tsis muaj curling ntawm ntug. Txawm tias tom qab peb xyoos ntawm kev hnav tsis tu ncua- ncua kev kawm theem pib, theem nrab, thiab theem siab- thiab ua kom haum lub duav uas tau nthuav dav los ntawm ob qhov loj, nws tseem muab kev txhawb nqa ruaj khov, zoo li ntuj thiab xis nyob zoo li yog ib feem ntawm lub cev nws tus kheej. Ntawm Kabenchen, peb tsis yog tsim khoom siv rau menyuam yaus xwb; peb tsim cov khoom me me, ntsiag to-tsis tau muaj kev ntseeg siab heev- ncej ntawm kev txhawb nqa uas nrog tus menyuam los ntawm txhua ceg nqa, txhua qhov tig, thiab txhua qhov kev sib tw ntawm lawv hnub.
