Is this the best summer skin-care product?

It's a staple in my handbag.

Image via Shiseido

A few weeks ago I met a friend for a coffee sometime between the hours of 10 am and 3 pm, when the sun’s rays are their strongest. Typically, this isn’t a problem for me—I dodge the sun like I dodge a sneezer on the street. But this time was different. I was with a French friend, which is to say I was trying not to act super North Amer…