Asics | GEL KINSEI OG GLACIER GREYA BIOMORPHIC FIT upper uses technology to give you a better fit and improved comfort, while the I. G. S (Impact Guidance System) technology helps your feet perform in a way that enhances natural gait. Great cushioning gives walking on air comfort, and this shoe has it in spades thanks to discreet GEL technology in the heel. There's also TRUSSTIC SYSTEM technology, a moulded part under the middle of the foot that provides stability.