Sun protection factor is the length of time you're able to stay in the sun without causing sun damage to your skin. The higher the level of
SPF the longer you can stay exposed to the sun, and this is
dependent on your skin type so while everyone planning on going out in the sun needs to wear sunscreen, the SPF necessary to protect your skin varies from person to person. The darker your natural skin type the more natural protection you have from the sun, but even if you have darker skin you must always wear sunscreen.
The level of SPF you need also depends on the time of day as the sun is strongest in the middle of the day (between 11am & 3pm in the UK), so keep this in mind when choosing your sunscreen, and think about purchasing either a high factor you can use for the whole day or a range of factors that you can switch between.
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