Design: Engineered spacer mesh upper for style and breathability Low drop with retuned rocker shape geometry for a smooth transition and efficient toe-off Altra's Original FootShape Fit with room for your toes and space in the midfoot In-Shoe Comfort: Altra EGO(TM) FLO midsole foam ensures a soft, max-cushioned ride Innerflex(TM) technology grid-like grooves in the midsole that help to provide flexibility and transfer power from the foot to the ground Durability & Traction: Rubber outsole provides surefooted traction Additional Details: Best for: Road running, Walking Heel-to-Toe Drop: 4mm Weight: 8.3 oz / 235.3 g