Unverified90% confidenceDecision RuleTime unknown

70%以上承托力来自下围而非肩带，下围过松是支撑失效和上跑的首要原因；新买文胸应扣最外排扣，随下围松弛逐步收紧，扣到最内排仍松即需更换或换小一号下围

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90%

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Long-term

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Unverified腰部调节设计中，内置弹力松紧+外部纽扣的组合比单纯抽绳更稳固不下坠，背负重装腰包时更舒适；可拆卸腰带则便于按背负系统调整82% similar Unverified文胸主要承托力来自下围而非肩带，正确穿戴时肩带承重应≤20%，若靠肩带勒紧才不下滑说明下围过松或尺码错误82% similar

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