SPF-Sun protection factors... What exactly is SPF or sun protection factor and what does it mean? The simple answer is that it is the ability of a sun scream to shield your skin from the harmful rays of the sun for a particular amount of time before your skin will burn. Of course we all have different skin types and some of us burn a lot quicker than others, so here is how you calculate the SPF you need for your skin type. By way of example, let ‘s...