Unverified90% confidenceFactTime unknown

梯度压缩的核心是脚踝处压力最大（100%），向上递减至小腿约70%，选购时确认标注为gradient/graduated compression而非均匀加压

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Unverified尺码需按小腿最大围（腿肚周长）而非鞋码或身高选择，围度选错会导致压力值偏差超过30%，紧一档易勒出凹痕、松一档失去压缩效果77% similar Unverified选购时务必量围度而非看S/M/L：膝套量髌骨中心上下15cm处腿围，踝套量踝骨最细处，围度差1-2cm就应换尺码，压缩产品尺码偏大等于失去压缩功能75% similar

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