The Nike FREE Bionic training shoe is designed for high-intensity training. Multi-layer upper is specifically designed to accommodate intense training moves. Integrated Flywire system offers adjustable lacing and dynamic lateral support. Lightweight, durable midsole with training-specific flexibility offers full freedom of movement, especially in the forefoot. Low-profile outsole with strategically placed rubber pods in the heel and forefoot gives training specific indoor and outdoor traction. Wt. 6.7 oz.