Setup, Compatibility & Care
The Nike Flex Runner 4 is designed to be worn straight out of the box. Because there are no laces, there is no setup required. When choosing a size, note that the snug fit is intentional for athletic support; if your child prefers extra room, consider measuring their feet while wearing their typical gym socks. To maintain the trainers, wipe the exterior with a damp cloth to remove dirt. If the shoes become very muddy, hand-wash them using mild soap and cold water, then air dry them away from direct heat sources to preserve the foam midsole's integrity.