Design: Streamlined, engineered mesh upper 3D Fit Print saddle pulls from the heel and wraps the midfoot for a secure cushioned fit Integrated Segmented Crash Pad accommodates any foot landing for smooth heel-to-toe transitions In-Shoe Comfort: Full-length, responsive BioMoGo DNA midsole dynamically adapts to your stride GuideRails® Holistic Support System keeps you moving comfortable by keeping excess movement in check Additional Information: Shoe type: Stability Previous model: Brooks Adrenaline GTS 20