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

New Balance 550s ($110 and up)

For marathoners, having a supportive, comfortable pair of shoes to wear off-the-run is nearly as important as wearing the right shoes on-the-run. "I like the 550s because I feel like I get support, but they don't have a high heel-to-toe drop like a running shoe," she says. Sisson has too many pairs to count, but her favorite may be the all-white pair, since it goes with a range of outfits. (Taylor Swift, on the other hand, is partial to the red and white colorway.)