Sun and wind can irritate the eyes after miles and miles on the road. Completely dark glasses are often too dark for roads with a thick tree canopy, which creates a dappled-light effect, making it hard to read the road for accident-inducing potholes. Photochromatic sunglasses adapt to the conditions and protect your peepers.
What to look for: The sunglasses should fit comfortably and not fly off when you turn your head quickly. The lenses should be made of plastic that bends rather than shatters on impact just in case you go down. A ventilation cutout will help prevent the glasses from fogging up as you sweat. The Tifosi Seek sunglasses ($50) fit both small and large faces, block the sun, and have nose pads with extra grip to keep your shades from sliding down your (sweaty) nose.