Lucky number 13? It is if you count a commitment to research as good fortune. The 13th version of this all-purpose favorite is the result of years of accumulated R&D. This Kayano boasts thicker gel cushioning units in the heel than previous models, resulting in an even smoother and sprightlier feel during both slower training runs and faster-paced workouts. There's enough support and cushioning here for both neutral runners and moderate overpronators. And the interior biomorphic material molds to your forefootthink Birkenstocks for runnersand drastically reduces friction and irritation. 12.6 oz; asics.comBonus: Available in multiple widths.Bummer: It feels a touch overweightthis shoe would be a perfect 10 if it were a shade lighter.