fabricImportedSurface: Road. Differential: 6 mm. Moisture-managing mesh upper with thin synthetic overlays. Dynamic Hammock System wraps under the foot and tightens through the eyelets for improved alignment and a better fit. Lace-up closure. Padded tongue and collar. Comfortable fabric lining offers a great in-shoe feel. Removable foam insole. Propulsion Plate creates a stable platform that promotes powerful and aligned toe-offs. Gearing Mechanism allows the heel and forefoot to move independently fGo fast and look good doing it in the Brooks? Neuro 2 running shoe!Predecessor: Neuro.Support Type: Neutral.Cushioning: Lightweight, flexible response.