SPF 15 blocks 93% of the sun's UVB rays, and increases incrementally from there as the SPF goes up (for example, SPF 30 blocks 97% of UV rays), according to the American Academy of Dermatology. SPF, or sun protection factor measures your level of protection against a sunburn. They recommend keeping the following attributes in mind when shopping: To compile guidance on how to shop for the best sunscreens, we spoke with three experts about different sunscreen formulations, filter ingredients, and minimum SPF requirements needed for proper protection. Best for sensitive skin: Blue Lizard Sensitive Mineral Sunscreen Lotion SPF 50+.
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