Design: Jacquard mesh upper for lightweight breathability Molded heel collar for improved fit In-Shoe Comfort: Updated Altra EGO(TM) MAX midsole foam for an elevated and comfortable on-foot experience FootPod(TM) technology in the outsole supports your foot's flexibility and helps the shoe move naturally with your body's movement, so you can interact with your environment Additional Details: Weight (size 8.5): 8.65 oz / 245.2 g