Providing the optimal blend of cushioning support and overall comfort. Ideal for those who over pronate, those predispositioned to an inward rolling motion as the foot progresses toward toe off. I.G.S-Impact guidance system, design philosophy in which the individual components of the shoe work together resulting in a more comfortable step and an improved gait. Personal Heel Fit-A special foam heel construction that guarantees a perfect fit around the heel. Solyte-proprietary cushioning material that provides an exceptionally lightweight midsole with escellent bounce back and durability. Rearfoot and Forefoot Gel Cushioning System-Silicone based material placed in critical areas of the sole which dampens shock when the foot hits the ground allowing for a smooth movement through the step and reducing the risk of injury. DuoMax-A proprietary Asics system that consists of two different density midsole materials and designed to provide smooth overpronation control, enhancing support and stability. Space Trusstic-An advanced system that creates a pocket between the Trusstic system and the midsole, allowing for greater midsole deformation and more efficient foot function. Giving the shoe more strength and stability. AHAR+-A thinner and lighter version of the Asics high abrasion resistant rubber. It is placed on heavy contact areas of the outsole to reduce wear. Guidance Line-Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. The 2170 has the guidance line full length in the sole running from heel to toe. ComforDry Sockliner-Insole placed inside the shoe which provides cushioning with anti microbial properties keeping the foot drier and healthier. Removable Sockliner-can be removed to accommodate a medical orthotic. Reflective upper for when visibility is poor. 3M Reflective-A special reflective material that enhances visibility when light is poor.