Updating the lightweight Nike running shoe with a military-inspired motif, the Nike Free RN 2018 GPX 'Atmosphere Grey' was released in February 2019 in a camouflage colorway. Designed to give runners a natural sensation, the sneaker sports a knit, stretch-mesh upper and Dynamic Fit system for support and anatomical comfort. Under the foot, the cushy foam midsole features a rounded heel to better roll with each foot strike, and deep flex grooves to mimic the feel of bare feet.