Asics Kayano 25 SP Northern Pack Inspired by the natural phenomenon of the Northern Lights, this special seasonal pack radiates energy. The 25th anniversary of the legendary GEL-Kayano® includes the next evolution of our ultra-lightweight FlyteFoam® cushioning: FlyteFoam® Propel and FlyteFoam® Lyte. These two cutting-edge technologies work together to deliver energized cushioning and exceptional comfort from heel to toe. Count on GEL-Kayano® 25 for a premium and reliable ride that stabilizes your foot and fits to perfection. Impact Guidance System (I.G.S®) ASICS® design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. FluidRide® Midsole FluidRide® provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. FluidFit® Upper ASICS FluidFit® upper technology combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot, creating a truly customized glove-like fit. Heel Clutching System™ Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Rearfoot and Forefoot GEL® Cushioning Systems Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. Dynamic DuoMax® Support System This evolution of DuoMax® system enhances stability and support, with reduced weight and increased platform support. Guidance