ASICS Lady GEL-Evolution 6 Running 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. Solyte 65 lasted - Enhancing the cushioning and support by utilizing Solyte in the construction of the shoe between the midsole and the upper. Adjusted in density specific to the level of support required from the running shoe.