Design: Revamped heel collar and engineered mesh upper Roomy toe box and zero drop, built to keep you comfortable and running INNERFLEX™ grid-like grooves in the midsole are designed to provide flexibility and movement FOOTPOD™ outsole technology encourages natural movement underfoot In-Shoe Comfort: Altra EGO™ foam is designed to harmonize the balance between responsivenessand comfort Additional Details: Weight: 10 oz / 283g Stack Height: 28mm Drop: 0mm