Lightweight racing flat for the athlete looking for high tech features. Excellent for cross-country, indoor track and outdoor track. Minimal and glove-like fitting upper with heel lobes for comfort fit. Full-length Phylon™ midsole. Heel Zoom Air™ unit provides fast, low-profile cushioning. Forefoot Duralon™ rubber pods add articulate flexibility and cushioning. Heel crash zone is covered with durable BRS 1000™ carbon rubber. Wt. 5.6 oz.