Asics' most cushioned and supportive road running shoe for women - the Kayano - is now 31 years old. To celebrate its anniversary, the Kayano 31 gets some unique improvements. Asics designers have developed a Knit Collar construction for a better fit and premium feel. The ultimate cushioned midsole provides luxurious softness underfoot. 4D Guidance SystemTM under the arch stabilises the feet and helps to prevent over-pronation.