Nike Flex Runner 3 SE Big Kids' Shoes An easy-to-pull-on design makes the Flex Runner a fan favorite. Made with playgrounds in mind, this iteration has a stretchy bootie, reinforced toe and metallic synthetic leather panels for added durability and shine. A flexible outsole helps provide traction on multiple surfaces, so you're always ready to play. Slip into Fun A stretchy bootie design helps provide a snug fit while ensuring these are easy to slip on and off. Made to Move Foam wraps around the heel to help provide stability when you quickly shift directions. To keep the foam outsole flexible, we added flex grooves throughout, helping every step feel natural. Multiple tread patterns help provide durable traction. Made to Play Synthetic leather overlays work with straps at the heel and top of your foot to help provide durability and support. Breathable mesh helps keep the shoe lightweight and helps your feet stay cool. Reinforced toe adds durability. Pull tabs on the heel and tongue help make the shoe easy to take on and off.