Nike Free TR 9 Ultra Ladies Trainers. Nike Free TR 9 Ultra Ladies TrainersThe Nike Free TR 9 Ultra is lightweight and flexible to be quick and adaptable for whatever workout you take on. The slip-on design has Flywire cables to securely hold your foot. Soft, flexible foam cushioning has a wider surface area for more stability.FREE TO FLEX. FIT TO TRAIN.> Nike free sole is made of soft foam that's flexible to bend in any direction.> Heel is flatter to create a wider surface for more stability during exercises such as squats.> Synthetic material and fabric are durable and lightweight.> Flywire cables create a secure fit around your foot.> Slip-on design is easy to take on and off.