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According to this health-related website, you should still wear a shirt: You should not think of sunscreen as an alternative to avoiding the sun or covering up. It is used in addition. Sunscreens should not be used to allow you to remain in the sun for longer - use them only to give yourself greater protection. No sunscreen is 100% effective and so it ...


2

Assuming you're reapplying the screen often (sweat washes it away) and it's a quality one, then it would do for what matters sun protection (although you should still properly cover your head with a hat or a bandana or whatever). That being said, I would use a shirt anyways; to protect your skin from the abrasion of the rucksack, to absorb some sweat, and ...



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