14 Products Every Marathoner Should Own, According to Pro Runner Emily Sisson

Oakley EVZero Blades ($16, originally $20)

Sunglasses are a must to protect the eyes on sunny runs, and Sisson likes her Oakleys both because they're super-lightweight, and because the lenses can adapt to changing light. "When I'm running on a trail or in the shade, I don't have to constantly be taking them off," she says. "When I was running through a tunnel at the Olympics, I kept them on the whole time, while other people were taking theirs off because they couldn't see."