NIKE Men's Free Trainer 5.0 V6 TB Running Shoes Synthetic/Mesh 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.