ASICS GEL-DS TRAINER 17 Racing Shoes I.G.S (Impact Guidance System) - For a more improved natural running gait, the individual parts of the shoe work together efficiently, gifting a more comfortable, guided step. Rear and Forefoot GEL - ASICS trademark cushioning system which absorbs impact force superbly, dampening shock in the initial heelstrike and allowing for a smooth transition through the step, greatly increasing comfort and performance and reducing the risk of injury. Guidance Line - Vertical Flex Groove running from heel to toe which encourages a more natural running gait improving step efficiency. SoLyte - Midsole material designed to absorb shock and cushion the foot. More durable and lighter than standard EVA products, a quality addition to any shoe. DuoMax Support System - A dual density midsole system positioned to enhance support and stability, positioned sport specifically.