Always be race-ready in this updated running shoe packed with innovative performance technology, superfoam cushioning and a durable XT-900 rubber sole.Perfect for: Designed as a race-day shoe, it's quickly proven itself much more, equally capable during long, moderate training sessions and sprints to the finish.Upper: The upper features an improved design of zonal engineered mesh and an integrated tongue for a connected, more secure fit, while the SRS (Super Responsive Sockliner) keeps every ste