One of the most recognized models in their lineup, ASICS GEL-Nimbus 18 running shoes feature a new gel placement that offers an improved geometry of cushioning. You'll experience improved adaptability and soften brisk impacts throughout your run. ASICS has reimagined the style of these again with fresh colors.Upper: FluidFit® combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot and create a truly customized glove-like fit. Heel Clutching System? provides improved support and creates improved heel fitting environment. Seamless Construction reduces the potential for irritation and friction caused by traditional stitches and seams. Discrete Eyelets disperse lace tension and create a customized fit environment and enhanced upper comfort. Mesh provides breathable flexibility.Midsole: Gender Specific Cushioning features a lower-density top layer in the midsole, allowing female athletes to better enjoy the benefits of midsole compression. Plus 3® provides 3mm of additional height to help alleviate Achilles tension. FluidRide™ provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability. Rearfoot and Forefoot GEL® Cushioning Systems attenuate shock during impact and toe-off phases, and allow movement on multiple planes as the foot transitions through the gait cycle. Guidance Trusstic System® integrates Guidance Line® construction for enhanced gait efficiency while providing midfoot structural integrity. ComforDry™ X-40 Sockliner features higher rebound properties while providing excellent moisture management, high-level breathability and antimicrobial properties. Outsole: Guidance Line® vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. AHAR® ASICS High Abrasion Rubber placed in critical areas of the outsole provide exceptional durability.