It used to be that a foundation primer’s main purpose was to stop your makeup from slipping off your face – now with a decent amount of added SPF they protect your skin from the elements as well. Personally I would never go below 30SPF on my face. There are a lot of foundation primers offering less protection, but why settle for less? And keep those with no sun protection for the evening.
During the day, sunny or otherwise, we all need protection from the sun’s rays and the best way to get it is very different from the oily facial sun blocks of the past which did no one any favours, just slick on one of these primers and you’re done.
Bear in mind we’re not talking about protection when sun bathing or swimming, then you do need something more powerful. But these are excellent for every day city walking about or when you’re generally out and about.