Brooks Womens Adrenaline GTS21 Running Shoes Sneakers Charcoal Gray Size 10 Excellent pre-owned condition some wear to the sole, rip on the heels Midsole: The full-length DNA LOFT midsole provides a softer ride. GuideRails: Helps prevent unwanted torsion and encourages a smooth roll. Heel: The broad heel helps prevent unwanted torsion and encourages a smooth roll. Upper: The Engineered Mesh upper provides improved airflow and a roomy toe box. 3D Fit Print: Added along the sides for structure.