Nike free 50 junior fitness trainers these nike free 50 junior fitness trainers feature hexagonal flex grooves to the sole to allow for great movement in every direction as well as woven mesh upper for breathability and a light weight feel these trainers also feature a a round heel that imitates the shape of your foot rolling with the ground and allowing for an extended range of motion kids trainers laaced fastening hexagonal flex grooves to outsole woven mesh upper li