The Piranha SP 2 is the lightest racing flat ASICS® has ever presented to the US market. It offers a platform that is designed to maintain perfect balance of a super fast road feel and exceptional platform comfort. The Piranha SP 2 weighs in at an amazing 4.2 oz, and will continue to offer the same lightweight tooling on a brand new, minimal upper. Open mesh upper provides excellent comfort and breathability. Solyte™ midsole offers improved cushioning and durability. Magic™ Sole minimizes weight and maximizes breathability. Wt. 4.2 oz.