What is SPF and why is it important?
SPF stands for Sun Protection Factor and is the universal measurement of protection against UV - ultra-violet - rays. It measures how much UV radiation is required to produce a sunburn on skin that's protected with sunscreen as opposed to how much UV radiation is required to produce a sunburn on unprotected skin.
Here's an example: An SPF 20 sunscreen will protect the skin against 20 times the exposure of UV rays than if you weren't wearing any sunscreen at all.
A common misconception is that a sunscreen's effectiveness can be calculated by multiplying the SPF value by the length of time it takes to get a sunburn without sunscreen. In reality, each person's sun exposure is dependent upon what time of the day it is, their geographic location, weather conditions, how long they're in the sun, and more.
The Importance of SPF
Studies have shown that the #1 cause of damage and aging to the skin is sun exposure. Excessive exposure to the sun's rays can cause wrinkling, a leathery skin appearance, and in worst cases - skin cancer. It's also been proven that overexposure to the sun can interfere with your immune system. Currently, sunscreen products containing a recommended SPF rating of 15 or above play an important role in helping diminish the harm of the sun's rays.
City Block Sheer Oil-Free Daily Face Protector SPF 25
Sheer, broad-spectrum UVA/UVB daily sunscreen. Lightweight formula helps wick away perspiration and absorb excess oil. Perfect alone or as an invisible makeup primer. No chemical sunscreens. Appropriate for eye area and sensitive skins.
- Skin Types: All
- How to use:
- Apply to clean skin
- Using fingertips, smooth evenly over cheeks, forehead, nose and chin. Blend.
- Follow with foundation
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