All you need to know about choosing the right sunscreen
WHAT IS SPF?
Sun Protection Factor – SPF, measures the level of UVB protection of a sun protection product.
A high SPF extends the amount of time you can expose in the sun and protecting your skin.
There are different levels of SPF:
Although no sunscreen can block ALL UVB rays, in terms of percentages, a sunscreen with:
SPF 15 will filter out approximately 93% of the UVB rays.
SPF 30 keeps out about 97% of the UVB rays.
SPF 50 blocks out around 98% of the UVB rays.
WHAT IS PA+?
PA simply means Protection Grade of UVA rays.
PA is based on the Persistent Pigment Darkening (PPD) – skin tanning reaction reading at 2-4 hours of sun exposure.
A person put on a sunscreen with More PA “+”, tends to be less tanned than a person put on sunscreen with less “+”,
given that they are exposed to the sun with the same length of time.
CHEMICAL SUNSCREEN VS PHYSICAL SUNSCREEN
WHEN TO USE?
Everyone needs sunscreen when outdoors for more than 15 minutes between 10 a.m. and 3 p.m. or if they're in direct sunlight coming through a window (UVA rays pass through glass). You should wear UV protection on cloudy days, too.
HOW TO USE?
Apply sunscreen 15 to 30 minutes before going outdoors. Cover all areas of the skin that will be exposed to the sun’s rays. Apply liberally. Most people, including children, need about 1 oz. of product to cover exposed areas sufficiently. Reapply every two hours. If you are swimming, reapply more frequently.