woman applying sunscreen

Photo: NicolasMcComber/iStock

4 of 6
Be Vigilant About SPF

Apply a broad-spectrum formula to your neck every day, says facialist Angelina Umansky of Spa Radiance in San Francisco. Dyer likes SkinCeuticals Physical Fusion UV Defense SPF 50, which contains zinc oxide and titanium dioxide. Unlike other physical sunscreens that can go on chalky, she says, this fluid "goes on smooth, doesn't leave a white residue and stays in place if you sweat," which means it also won't transfer onto the neckline of your clothing.