Nike Free Trainer 5.0 V6 Tb Mens - Black - 9 Synthetic/Mesh Made in USA Breathable mesh upper allow the foot to breathe. Welded flex zones allow for a full range of motion while training and lifting. Internal support structure holds your foot in place, keeping your form strong. Flexible hexagonal pods in the midsole allow for multi-directional movement. Rubber outsole with traction pattern for durable grip on multiple surfaces.