Women's Nike CK Racer shoes have a modern, dynamic design with influences from the original 90s MD Runner 2. The soft, knit upper and the quick lace-up system ensure a customized fit, while the seamless overlays provide a sleek appearance. Soft, knit upper inspired by Flyknit. Lace-up system with pass-through laces and stopper for a customized fit. Foam midsole for lightweight cushioning. Durable rubber with textured pattern on the heel for better grip. Comfortable EVA and memory foam insole for a cushioned feel. Dynamic Flywire threads in the midfoot for a snug fit. Fabric (100% nylon) Synthetic plastic.