A lightweight and flexible running shoe with a comfortable knit upper, the Nike Free RN Flyknit 2018 is a training tool built to help you run naturally. What's New Updated Knit upper is built to move more naturally with your foot. Modified midsole design creates a flexible and low to the ground experience. Modified Tri-Star outsole offers a redesigned flex groove system. Featuring a new design from top to bottom, the Nike Free RN Flyknit delivers an all new experience that continues to build off its predecessor. The shoe delivers a natural running experience with a Tri-Star outsole that now offers an updated flex groove system for an extremely flexible foot transition. The low profile design delivers a close to the ground feel while also keeping weight down. Finished off with a Flyknit upper for optimized comfort, the shoe delivers an adaptable on foot experience that keeps your foot locked in place.