If we had an award for efficiency, this shoe would win it uncontested. No shoe here converted downward heel impact into forward propulsion as well as the Testament, and testers reported a significant rebound leading up to the toe-off phase of every stride. Credit the springlike hard plastic "flow propulsion" mechanism in the heel and midfoot, which has the added benefit of being more durable than traditional EVA foam. Tip: We recommend this big, cushy ride for slower-paced runnersespecially those with wider, higher-volume feet. 12.7 oz; fila.comBonus: The stretchy forefoot mesh makes for a comfortable, unrestrictive toe box.Bummer: Sorry, overpronators. This cruiser is only for neutral runners.