Choosing the RIGHT Sunscreen matters because it is not about having higher SPF factor but the content and how it is formulated !
There are a lot of sunscreens on the market: some good, some bad and then the shameful as reported by EWG in their website ( http://www.ewg.org/2015sunscreen/hall-of-shame/ )
Choosing the wrong sunscreen not only is a waste of money and time but also potentially harmful !
What you should not consider ?
What Is SPF ?