All day comfort and versatility. The Techknit RNR-1 Trainer features SurgeNRG+ enhanced with supercritical foam for ultimate all day comfort and durable support for any movement. The Techknit 3D knit upper construction is also a key feature of this shoe, as it provides the perfect amount of breathability to keep you moving comfortably. Technology - Techknit Engineered Mesh - Surge NRG+ Foam enhanced with supercritical foam for ultimate response and durable support for any movement Features - Lightweight breathability - Secure engineered lacing system - Beveled Heel to assist with landing control - Carbon rubber outsole for maximized traction and durability - Gusseted tongue to prevent shifting - Molded sockliner - 3mm supercritical TPU topsole - 4mm heel-to-toe drop