For a touch more cush and a slimmer, race-ready fit, we lace into the Altra Rivera 3 Running Shoe. The Slim FootShape fit shaves girth heel to toe for a performance-oriented fit that still lets our toes splay freely. As we run, the flexible zero-drop platform lets our feet act as they would barefoot while armoring them with Altra EGO foam for more shock absorption. Color: yellow