DESC: Most people's favorite pastimes do not include jumping on the treadmill, but now yours do!; The Gel-Treadmill is specifically designed to enhance treadmill training. Impact Guidance System (I.G.S. enhances the foot's natural gate from heel strike to toe-off. Solyte Midsole Material is lighter than ASIC'S standard EVA and SpEVA, which improves cushioning and durability. The Asics GEL Cushioning System absorbs shock during impact phases for superior comfort. Sole vents placed throughout the bottom of the shoe increase air circulation within the shoe.