MIDSOLE

• Altra Ego is a midsole compound designed for high energy return, providing high levels of durability and responsiveness.
• Inner Flex is comprised of a flex grooves system that provides additional flexibility and cuts weight for increased performance.
• FOOTSHAPE Design follows the natural shape of the foot for ultimate comfort.
• Standard Footshape is Altra's most common footshape that sits right in the middle of the Original and Slim fit options. This fit will be slightly slimmer than the Original roomier fit.

OUTSOLE

• FootPod Outsole follows the natural construction of the human foot for maximum flexibility and a responsive ride.

UPPER

• Engineered Knit Mesh conforms to the foot for a sock-like wrap that is sleek and breathable.
• Decoupled Heel uses minimal construction on the upper for a fast feel.