Athletic Propulsion Labs introduces the TechLoom Zipline trainer with new construction techniques to further improve performance. This sublime runner features a seamless single-layer upper with lightweight breathability throughout and engineered ribbing along the tongue and collar to provide stretch where needed. This performance sports shoe provides both lateral and longitudinal support without compromising flexibility and lightweight running experience. The APL FutureFoam™ midsole, with an internal Souffle sockliner, ensures long-lasting, responsive cushioning to the max.