ASICS GEL-KAYANO 31 / 27cm Used for approximately 20km. Thank you. From light running to full marathons, the GEL-KAYANO 31 is designed to provide excellent comfort and stability. The "4D GUIDANCE SYSTEM" provides adaptive stability. This foam part, placed on the inside of the midsole, helps to restore the arch to the proper position with each ground impact during running, supporting a more efficient run. In addition, the midsole is equipped with FF BLAST PLUS ECO cushioning. This foam material is approximately 24% bio-based, providing soft cushioning while being environmentally friendly. PureGEL technology is placed in the heel and is characterized by being approximately 65% softer than the conventional visible GEL technology. By changing the upper from the previous knit to mesh, breathability has been improved. HYBRID ASICSGRIP, which combines ASICSGRIP with excellent grip in the midfoot of the outsole and AHARPLUS with excellent abrasion resistance in the toe and heel, provides both excellent grip and durability.