Shoes with various configurations of rollers secured to one region of their soles for rolling, while leaving another sole region exposed for walking. The rollers are mounted to rotate about an axle defining a primary axis of rotation extending at an angle of between about zero and 45 degrees to the walking...http://www.google.fr/patents/US20040212160?utm_source=gb-gplus-shareBrevet US20040212160 - Shoes for walking and rolling
