We can only imagine the highly caffeinated sessions that produced the Overdrive. No detail has been left out or unexamined, from integrated drain holes in the outsole to a protected gaiter strap channel under the arch to drawcord lacing that adjusts easily even with cold or gloved hands. Innovative tubular cushioningMerrell calls it TrailSpring technologyabsorbs heel-strike impact and should outlast foam. Even after a 16-mile trail run to the base of Capitol Peak, near Aspen, the padding left one tester's feet feeling fresh (well, as fresh as could be expected). A TPU plate stabilizes the shoe, and forefoot grooves increase flex. A wide fit is good for foot-swelling epics (adventure race, anyone?).Bonus: The Vibram sole barely showed wear.Bummer: Not for the narrow-footed. 13 oz; www.merrell.com
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