Want to know the secret to happy feet? We've discovered it — and it's so compact, it actually fits inside our handbag. Two words: foldable flats. These versatile, super stealthy soles have come a long way since the basic black Dr. Scholl's Fast Flats (which we love, too!) and to date, we've spotted ultracool versions in snakeskin, metallic, and patent leather. Whether you plan on donning these ballet-inspired shoes all day or swapping them out for sky-high heels once you reach your final destination, these rollup flats take up minimal space in your bag and look cute to boot. The bottom line: on-the-go ladies need not kill their feet running around. To fete the beginning of our own foldable flats-wearing revolution, we've culled 10 pairs that serve a practical purpose and prove chic sole-mates.