UV rays are made up of UVA and UVB rays. UVA penetrate the deepest layer of your skin causing aging and wrinkling while UVB will burn the superficial layers of your skin. Sunblock is very important as it helps to protect our skin from the damaging UV rays from the sun. Choose a sunblock that protects against both UVA and UVB. Use products containing zinc oxide or titanium dioxide because they protect against the full spectrum of UVA rays. Each sunblock has a different SPF level to block the radiation. SPF stands for Sun Protection Factor which tells us how well the sunblock will protect the skin from the UV rays. If your skin will get burnt in 15mins under the sun without sunblock, wearing a SPF 15 would mean it would take 15 times the duration for your skin to get burnt which will be 225mins (3hrs 45mins). Sunblock should be applied everyday and not just days when you think it is sunny. Applying a quarter teaspoon amount is most recommended for just the face and a shot glass amount for body. Using a minimum SPF sunblock of 15-30 is most recommended for everyday use.
SUNBLOCK SPF GUIDE