That means the roof terraces beer gardens and parks are all rammed full of people soaking up the rays. For example spf 15 means that 1 15 of the burning radiation will reach the skin assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter mgcm 2. Us Sunscreens Get Flunking Grade For Uva Protection Ewg The uva star system.
