The MBT-2000 Soles Are Performance Shoes For Running and Have a Level 2 Rock The Upper Portion of The Shoes Are Made With Mesh/Synthetic Pu The MBT-2000 Soles Have Received APMA Seal of Acceptance promoting good foot health. This shoe is sized for Men The key to our innovative technology is our unique curved sole design and pivot axis. This design encourages a rolling motion from heel to toe with minimal bending of the foot, mimicking the natural movement.