Here are a few things that one needs to understand first: SPF
There are also two types of Sun protection - Physical and Chemical
Sunblock provides the physical kind of protection which contains both organic and non-organic ingredients that sit on top of the skin acting as a barrier between your skin and harmful UV rays by reflecting or scattering UVB light. Sunblock is best used for anyone planning to spend hours in the sun at a time. Most of us don't like the idea of being covered head to toe in what looks like white paint, but that sunblock for you.