Introducing The ONE™ by Altra - a fast, lightly cushioned, do-it-all performance shoe that provides the durability of a training shoe with the weight of a go-fast performance shoe. From a casual 7-mile run, to a marathon PR, or mile repeats, this shoe delivers comfortable, lightly cushioned performance. The 2-layer midsole with AltraBound allows for maximum responsive energy return while the SpeedPod™outsole maps the bones of the foot for natural flexibility. Plus, the Zero Drop™ design allows for natural loading of the calf and Achilles while optimizing the landing angle to ensure maximum power with minimal impact. The ONE™ is the one shoe to handle any run on any occasion.