Design: Updated engineered knit upper for a sock-like, forgiving fit Roomy toe box provides plenty of room to help your toes move freely, and space through the midfoot In-Shoe Comfort: Altra EGO(TM) midsole foam and 24mm stack height for an iconic Altra(R) underfoot experience Original FootShape(TM) Fit and zero drop encourages natural movement InnerFlex(TM) midsole is composed of grid-like grooves designed to provide flexibility and movement 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: 9.5 oz / 269 g Heel-to-Toe Drop: 0mm This product received the American Podiatric Medical Association (APMA) Seal of Acceptance, awarded to products found by the Association to promote good foot health