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. Features Techknit 3D Knit Construction: This innovative knit upper is lightweight and comfortable, providing a superior stretch for a natural fit and exceptional breathability to keep your feet cool. SurgeNRG+ Foam: Experience a pillowy ride with SurgeNRG+ foam boosted by supercritical technology for unmatched cushioning and long-lasting support. Carbon Rubber Outsole: Get maximum grip and durability with this high-traction carbon rubber outsole, built to handle any terrain. Gusseted Tongue: Enjoy a secure, comfortable fit with this gusseted tongue that stays in place during movement. Additional Features Molded sockliner for added comfort 3mm supercritical TPU topsole for energy return 4mm heel-to-toe drop for a natural feel Weighs only 9.2oz (size 9.5) Size Guide: