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What is sun protection factor?

Sun Protection Factor, or SPF, is a measure that indicates how well a sunscreen can protect your skin from the sun's harmful ultraviolet (UV) rays. The higher the SPF number, the greater the protection it offers against sunburn and skin damage. For example, an SPF of 30 means it would take 30 times longer for your skin to burn compared to not wearing any sunscreen at all.

Key points:

• SPF measures protection against UVB rays, which cause sunburn.
• Higher SPF numbers provide greater protection but do not block all rays.
• Sunscreen should be reapplied regularly, especially after swimming or sweating.
• Broad-spectrum sunscreens protect against both UVA and UVB rays.

This text has been fact-checked for accuracy by medino's clinical team.