Danger ranking: 2. "These saved my life when I was a resident. But while they're great for standing, they're a little too unstable for distance walking."
Best for: Swaying at a mellow concert; preparing hors d'oeuvres for a party
Avoid: Sightseeing around Europe
Doctor's note: "If you're going to be doing a lot of walking, your best bet really is a pair of stylish athletic sneakers."