The shoe that"s been helping runners improve for over twenty years just keeps getting better. Featuring many innovative technologies such as the FluidRideTM and an Ortholite X-40 sockliner, the Asics Gel-Kayano 21 Running Shoes now gets you closer to a new personal best with every step. The ASICS GEL-KAYANO® 21 stays true to its successful reputation between runners, improving upon its famous ride with technically advanced features that consist of the new innovative technologies that will take your running to another level. Such as Fluid Ride, a 2-layered midsole construction featuring a combination of both SpEVA and Solyte, providing unprecedented underfoot comfort and a plush ride. As well as a new upper construction (FluidFitTM), that offers a personalised fit, immense breathability and unmatched comfort to help you get on your way. The new updates include: FluidRideTM for a better ride. X-40 sockliner for the lightest and most luxuriously stable ride yet. 10 grams lighter then its predecessor.