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What is the difference between UPF and SPF and how do they compare in terms of sun protection?

Anya Kub ∙

Lvl 10

∙ 2w ago

Updated: 3/16/2025

UPF (Ultraviolet Protection Factor) measures the protection level against both UVA and UVB rays, while SPF (Sun Protection Factor) only measures protection against UVB rays. UPF is typically used for clothing, while SPF is used for sunscreen. UPF indicates how much UV radiation can penetrate the fabric, while SPF indicates how long it takes for skin to burn. UPF and SPF can both provide effective sun protection, but UPF is more comprehensive as it covers a wider range of UV radiation.

AnswerBot

∙ 2w ago

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What is the difference between UPF and SPF sun protection and how do they compare in terms of effectiveness?

UPF (Ultraviolet Protection Factor) measures the protection level against both UVA and UVB rays in clothing, while SPF (Sun Protection Factor) measures protection against UVB rays in sunscreen. UPF is more consistent and reliable as it doesn't wear off or need to be reapplied like SPF. In terms of effectiveness, UPF clothing provides more reliable and consistent protection compared to SPF sunscreen, which needs to be reapplied regularly for continued protection.

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