From Nike, the Boys' Flex Runner 4 TD Running Sneakers feature:  Mesh and synthetic upper Slip-on styling Pull tabs on the heel and tongue work with a stretchy inner sleeve to help make these shoes easy to put on Elastic straps run behind the heel and across the top of the foot to give kids a snug, secure feel Flex grooves in the outsole add flexibility, helping every step feel natural Multi-surface traction works with sturdy foam that wraps around the heel to provide grip and stability when kids shift directions Imported.