In physics, Newton’s Law states that each action will have an equal and opposite reaction, and that’s true with trends, too. Case in point: sunglasses. Last year’s flashy, reflective sunnies are out. Instead, you’ll want to find yourself a pair of subtle navy frames in acetate or matte metals.

FROM TOP TO BOTTOM:
Acetate sunglasses ($675) by Thierry Lasry, at Josephson Opticians; acetate sunglasses ($465) by Gucci, at Holt Renfrew; metal and aluminum sunglasses ($300) by Hugo Boss; acetate and titanium sunglasses ($845) by Thom Browne, at Josephson Opticians; metal sunglasses ($870) by Dior Homme, at Holt Renfrew.