Unverified80% confidenceTradeoffTime unknown
外壳材质权衡：硬壳PP/EPS头盔抗冲击强但重、闷热；一体成型（in-mold）头盔更轻透气但抗多次撞击差。日常低速通勤选一体成型减轻颈部负担，竞速/陡坡选硬壳
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