Unverified85% confidenceDecision RuleTime unknown

头围适配需实测：用软尺量眉毛上方1指处一圈，头盔调节范围应覆盖实测值±2cm，且实测值最好落在头盔标称范围的中段而非上下限，避免快速长大后立即不合适

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儿童运动头盔category

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Unverified尺码选择需实测头围：用软尺沿眉毛上方2cm水平绕头一周测量，对照品牌尺码表选择，头盔戴上后前额距眉毛约两指宽，左右晃动头盔头皮应随之移动而非头盔滑动92% similar Unverified选购前用软尺量额头上方一圈周长对照厂商尺码表，头盔戴正后应低于眉毛约两指宽，下颚带扣紧后能塞进一指为松紧合适89% similar

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