Altra - Men's Rivera 3 Running ShoesFeaturing a breathable layered mesh upper and tongue to keep feet cool, this athletic shoe prides itself on a secure Slim FootShape fit. The molded heel collar ensures stability, while the 28 mm stack height with Altra EGO midsole foam delivers a soft, responsive ride. Its FootPod outsole maps natural foot structure, complemented by a 0 mm drop for a natural, balanced stride. Weighing in at 278 g.