The shoe that's been helping runners improve for over twenty years just keeps getting better. Featuring many innovative technologies such as the FluidRide™ 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 (FluidFit™), that offers a personalised fit, immense breathability and unmatched comfort to help you get on your way.

The new updates include:

• FluidRide™ for a better ride.
• X-40 sockliner for the lightest and most luxuriously stable ride yet.
• 10 grams lighter then its predecessor.

Features

• ** NEW ** FluidRide™ - FluidRide™ provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability.
• ** NEW ** Ortholite X-40 Sockliner - This premium sockliner features higher rebound properties while providing excellent moisture management, high-level breathability, and anticrobial properties.
• ** NEW ** Weight 305KG - 10 grams lighter then its predecessor.
• FluidFit™ Upper Construction - Features 4-way stretch mesh and stretch reinforcements throughout the entire quarter panel on both medial and lateral sides, providing a personalized fit and improved breathability for unmatched upper comfort.
• Soft Top DuoMax® - Men on average, typically weigh more than women, which tends to mean they will compress a midsole more than the average woman. Because of this, the KAYANO is constructed with a firmer 53 degree Solyte® layer for men and a softer 48 degree Solyte for women to help combat this.
• DuoTech Warm - This is ideal for warm days with its perfect moisture management it means runners stay comfortable and dry which increases comfort as well as performance. It is part of ASICS's advanced DuoTech range, which provides high-quality, comfortable fabrics that protect and remain comfortable regardless of activity or weather conditions.
• Space Master UV - ASICS innovative upper material technology. Construction of weave and material provides enhanced moisture management with improved ventilation. Anti UV properties provides protection against harmful effects of the Sun.
• Biomorphic Fit - Biomorphic technology is incorporated into the upper where the areas of highest deformation are found. This ensures a better fit, improved comfort, less risk of injury and enhanced performance.
• Discrete eyelets - This is where the laces are fed through, which helps to reduce irritation and improve fit.
• Asymmetrical Lacing system - A lacing system the follows the natural curve of the foot to ensure a perfect fit and less friction.
• FluidRide™ Midsole - Features a two-layer construction that blends luxurious lightweight cushioning and a responsive bouncy underfoot comfort.
• Gender Specific Midfoot design - Incorporated within Space Trusstic a technology to provide for the different biomechanical function exhibited by the male and female mid foot.
• Solyte Midsole - Proprietary cushioning material that provides an exceptionally lightweight midsole with excellent bounce-back and durability.
• Removable ComforDry sockliner - This insole provides the optimum cushioning performance system that creates a cooler, drier, healthier shoe environment.
• Personal Heel Fit - A special foam heel construction that guarantees a perfect fit around the wearer's heel.
• Solyte 55 lasted - Enhancing the cushioning and support by utilizing Solyte in the construction of the shoe between the midsole and the upper. Adjusted in density specific to the level of support required from the running shoe.
• AHAR+ - This is a thinner and lighter version of ASICS High Abrasion Rubber. It is placed on heavy contact areas of the outsole to reduce excessive wear.
• Durasponge Rubber Forefoot - A blown AHAR rubber outsole material with high abrasion-resistant qualities for added durability, combined with a comfortable cushioned ride.
• Dynamic DuoMax® - A multi-rigid shape to help with over-pronation. Fans of the KAYANO series will enjoy the same level of support and stability felt in previous models, but weighing in over 15 grams lighter than the previous Kayano models.
• Guidance Trusstic - This trusstic system integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity for a more consistent and directional ride underfoot.
• Full-length Guidance Line - Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency.
• I.G.S - ASICS Design Philosophy employs linked components that enhances the foot's natural gait from heel strike to toe-off for improved running efficiency and an improved ride underfoot.
• Space Trusstic - An advanced system that creates a pocket between the Trusstic system and the midsole, allowing for greater midsole deformation and more efficient foot function.
• Heel Clutching System™ - The final update for the Kayano lies with this technology. This removes the traditional internal heel components and replaces it with an exoskeletal heel counter. This provides a more comfortable heel fitting environment while decreasing the probability of friction or irritation which can lead to injury and blisters.
• Visible Rearfoot GEL - The ASICS GEL system is based on a special kind of silicon that enables optimal shock absorption. GEL units are strategically placed in the midsole and designed to enable specific functions and positions.
• Decoupled Heel - Addresses shearing forces at heel strike.
• 3M Reflective - 3M Reflective - Improved footwear visibility when running in low level light.