5. SBS zipper du thiab yooj yim kov: Cov tawv kov ua rau cov khoom siv kom zoo nkauj nqa tau yooj yim dua thiab dai, ntxiv dag zog rau hauv qab nrog tawv kom nws hnav resistant.Kev sib xyaw ntawm zipper thiab zipper pob ntseg ua kom yooj yim rau tuav thiab rub thiab nqis.Lub hnab tso quav tso quav no yog qhov loj tshaj plaws los ntim rau hauv koj lub hnab ntim khoom