Introducing the Tubes Sport Trail, a new trail inspired upper on our patented Tubes system. The technology provides unmatched comfort and cushioning through individually tuned tube structures that collapse and rebound as you walk. The design also provides incredible flexibility making every stride smooth and efficient. Smaller, more rigid tubes on the inside area of the heel provide extra medial support to reduce pronation. The Tubes Sport Trail also features an updated rubber outsole with more aggressive tread design and back outrigger to disperse any liquids that you may run in. The design is finished with a new thermoplastic polyurethane eye row and heel pull. Tubes Sport Trail Running Shoes