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Sunscreen is rated by sun protection factor (SPF), a multiplier of the amount of time the skin can be exposed to the sun before experiencing sunburn. The American Academy of Dermatology recommends using broad-spectrum sunscreen with an SPF of at least 15.
Even with sunscreen skin can collect damaging radiation. Wear protective clothing and head covering during the midday hours.

www.bananaboat.com/sun-safety/spf-chart

Use this handy SPF chart to choose an SPF protection level based on your skin type and amount of time you plan to spend in the sun.

www.no-ad.com/spf-chart.html

Use this chart to determine which SPF (Sun Protection Factor) you should use based on your skin type and the amount of time you expect to be in the sun on an  ...

www.sun-protection-and-products-guide.com/SPF.html

The SPF rating system was developed back in 1962 by Franz Greiter to measure the capacity of a sunscreen to block UVB radiation. The current SPF rating ...

www.webmd.com/beauty/features/high-spf-sunscreens-are-they-better

Nov 9, 2012 ... WebMD discusses the pros and cons of high SPF sunscreens.

finance.yahoo.com/chart/SPF

At Yahoo Finance, you get free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates ...

www.theskincentermd.com/blog/2013/06/best-sunscreen-spf-misleading

Jun 27, 2013 ... Sunscreen SPF chart When looking for the best sunscreen (or “best sunblock”) you might think that an SPF protection of 60 is twice as good as ...

www.epa.gov/sunsafety/uv-index-scale-1

Dec 28, 2016 ... If you burn easily, cover up and use broad spectrum SPF 30+ sunscreen. Watch out for bright surfaces, like sand, water and snow, which reflect ...

www.epa.gov/sites/production/files/documents/sunscreen.pdf

when properly used, an SPF of 15 protects the skin from 93 percent of UVB radiation, and an SPF 30 sunscreen provides 97 percent protection (see chart.

health.howstuffworks.com/skin-care/beauty/sun-care/spf1.htm

So, now we know that a higher SPF number means more sun-exposure time. It also indicates the level of UVB absorption, but this number doesn't increase ...