A lightweight and flexible running shoe, the Nike Free RN 2018 is a training tool built to help you run naturally. What's New New Circular knit upper creates a stretchy adaptable wrap. 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 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 new stretchy mesh upper, the shoe delivers an even more adaptable on foot experience that feels even more like an extension of your foot.