The Nike Wmns Free RN 2018 'Black' sneaker was created to improve short-term running and sprinting performance with flexible technology. The circular-knit upper is woven with spandex and supported by Flywire cables that are integrated into the lacing system. This women's shoe has a rounded heel that is reinforced with wide strap and padding. Its lightweight foam sole expands and contracts with the foot for natural range of motion.