Asics - Gel-Kayano XI (White/Liquid Silver/Citron) - Men's: The gold standard in performance footwear. Impact Guidance System (I.G.S.) is an ASICS design philosophy that uses linked componentry to encourage optimal gait while allowing for natural foot movement from heel strike to toe-off. DuoMax Medial Post ensures that the shoe maintains proper support for the foot during the critical transition from heel strike to toe-off. DuoTruss System, a two density Trusstic System links the rearfoot and forefoot and maintains midfoot support. GEL Cushioning Systems provide maximum rearfoot and forefoot shock attenuation. Biomorphic Fit Upper provides enhanced upper fit and comfort while decreasing the potential for irritation. Shoe weighs 12.5 oz.