FREE TO FLEX. Free movement with Nike Free TR 8 Women's Training Shoe which is designed to follow and expand with your foot and comes with a rounded toe and aggressive notches for optimal flexibility when you train. The durable 3D print on the stretchy mesh upper is a winning combination in terms of structure, flexibility and breathability. 3D printing on the net surface for flexibility and breathability. The flywire cables are integrated with the lacing for a snug fit around the middle of the foot. The shoe's boot construction creates a sock-like fit. The insole's inserted unit provides lightweight shock absorption. The flat heel creates a wider contact surface for improved stability. Flex grooves give the foot natural mobility.