For runners seeking a perfect blend of comfort, cushioning and support. 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. Full Length SpEVA® midsole material for increased shock attenuation and midsole durability. DuoTruss® System is a two density Trusstic System® which links the rearfoot and forefoot and maintains midfoot support. SpEVA® 55 Last for increased cushioning and durability. GT 2100 TN554 - B Width TN555 - D Width Sizes 5-10 $79.99