All of the experts we consulted unanimously agreed on one thing: that sunscreen is, hands down, the most crucial skin-care product. It’s “of utmost importance as part of your year-round regimen,” Dr. Charles points out. “Daily and consistent sunscreen use helps to prevent the development of fine lines and wrinkles, textural imperfections, and changes in the appearance of pores over time. More importantly, daily sunscreen use can help to prevent the formation of certain skin cancers.” To make it easy to remember, experts recommend using a daily moisturizer with a built-in broad spectrum SPF of at least 30.