ASICS GEL-Kayano 21 - Women's The new Kayano is updated with the best in ASICS innovation for the lightest and most luxuriously stable ride yet. FluidFit™ upper combines multidirectional stretch mesh with stretch reinforcements that adapt to your foot, creating a truly customized glove-like fit. Heel Clutching System™ improves support and creates a better heel fitting environment. ComforDry™ X-40 Sockliner with anti-odor properties for a cooler, drier, healthier environment. FluidRide™ midsole technology combines the ultimate bounce-back and cushioning properties with reduced weight and exceptional durability. DuoMax® Support System consists of a dual-density midsole positioned to enhance support and stability for performance. Guidance Trusstic System® integrates Guidance Line® technology to enhance gait efficency and provide structural integrity through the midfoot. Heel and forefoot GEL® Cushioning Systems and Impact Guidance System (I.G.S®) absorb and disperse shock during impact and toe-off phases, allowing natural foot movement as you move through the gait cycle. Guidance Line® technology in the outsole employs vertical flex grooves to decouple the tooling along the line of progression for enhanced gait efficiency and performance. Wt. 8.9 oz.