Unverified85% confidenceDecision RuleTime unknown
防晒速干衬衫看UPF值，UPF40+才有实际防晒意义，UPF50+能阻隔98%以上紫外线；但真正防晒力来自织物密度和后整理，浅色薄款即使标UPF50实测也常缩水，深色或密织更可靠
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Unverified防晒速干T恤的UPF值需≥40才有实际意义（UPF40+可阻挡97.5%紫外线，UPF50+阻挡98%以上），深色面料防晒优于浅色，但深色吸热更闷需搭配透气网眼设计91% similarUnverified防晒选购看UPF值，UPF40+才有实质防晒意义（阻隔97.5%以上UV），UPF50+阻隔98%以上；深色和高密度织物防晒更好，但纯物理结构防晒会随水洗次数衰减，化学涂层防晒约30次洗涤后明显下降89% similarUnverified防晒指数看UPF值而非面料厚度，UPF50+可阻挡98%以上紫外线；深色、高密度编织的速干面料UPF通常更高，但深色吸热，户外正午长时间运动应在UPF与浅色散热间权衡88% similar
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