Altra Rivera Men's Gray/Orange Introducing the Altra Rivera: your go-to road shoe for daily runs. This neutral trainer combines style and versatility to handle different activities, from tempo workouts to weekly long runs. Step into a sleek engineered mesh upper to stay cool and comfortable during your training. Enjoy every stride on the soft and responsive Altra EGO™ midsole. The Bio Heel technology mimics your body's natural form while Innerflex™ grooves improve flexibility, helping you become one with the road. Who's it for? Neutral runners searching for a sleek, versatile shoe they can use for different training runs. Altra Fans looking for a shoe that sits in between the Torin and Escalante in the company's road running lineup. Shoe Technology Upper: Engineered mesh upper offers lightweight comfort. FootShape™ toe box allows your toes to spread out naturally for more power and stability. Midsole: Altra EGO™ midsole delivers a soft yet responsive ride. Balanced™ cushioning platform keeps heel and forefoot at the same height from the ground, encouraging better form and low-impact landings. Outsole: Footpod™ outsole technology maps the bones and tendons of the foot to help it bend and move naturally. Bio Heel mimics the form of a human heel for smooth transitions and neutral Innerflex™ increases flexibility.