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The superlight Altra One V3 will stand up to miles of speed training and racing alike. With an updated, reinforced upper featuring a TPU overlay, and the firmer Innerflex midsole, the One V3 acts like an extension of your foot. The FootShape toe box and Fully Cushioned Zero Drop platform keep you comfortably running with proper form, even on tired legs. The One V3 does not have the same soft ride as the One 2.5, but a firmer, performance-minded feel, perfect for road racing and speed training sessions.