Nike Sonic Fly Big Kids' Running Shoes Why run when you can fly? Designed for record breakers in the making, the Nike Sonic Fly pairs a lightweight design with soft, springy foam that helps add energy to every stride. Responsive Cushioning We packed the midsole with soft and springy foam that absorbs impact and adds energy to every stride you take. Lightweight But Durable Less weight means more speed. Mesh throughout the upper helps keep these shoes lightweight and breathable. We reinforced the toe and sides for added durability. Support You Can Feel A stretchy band under the laces helps add stability and containment. Traction That Keeps Up Rubber outsole with Waffle-inspired tread pattern helps provide durable traction.