Kids' Nike Infant & Toddler Flex Runner Print 4 Running Shoes The Nike Flex Runner 4 Print Running Shoes are slip-on kids’ sneakers designed for easy everyday play and on-the-go comfort. This pair features a stretchy-looking upper with a colorful printed toe area and a supportive midfoot band that helps keep the fit secure. A lightweight, flexible sole and heel pull tab make them simple for kids to get on and off.