Multiple choice general knowledge science & technology

Putting on two different SPFs adds up to higher sun protection.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

SPF (Sun Protection Factor) does NOT work additively. Layering SPF 15 and SPF 20 does NOT give you SPF 35 - you only get the protection of the highest SPF applied (SPF 20 in this case). SPF measures protection against UVB rays, and applying multiple products doesn't multiply the protection. You should always use one product with adequate SPF.

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