Details A smooth, comfortable ride that's 20 years in the making. Packed with revolutionary lightweight FlyteFoam® cushioning and other advanced technology from the ASICS® Institute of Sport Science, the men's Asics Gel Nimbus 21 caters to neutral runners of all levels. Its gradient jacquard-mesh FluidFit® upper strategically adapts to your foot's natural motion while 3-D printed overlays offer extra support to give you a more customized fit that keeps you going mile after mile. Upper FluidFit® Upper: Combined multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot, creating a truly customized glove-like fit. Seamless Construction: The use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams. Ortholite® X-40 Sock liner: This premium sock liner features higher rebound properties while providing excellent moisture management and a high-level of breathability. Midsole Flytefoam® Midsole: FlyteFoam technology provides exceptional bounce back and responsiveness no matter the distance, utilizing organic super fibers to help reduce packing out that traditionally happens with softer, low density foams. Guidance Line® Midsole: Vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency. Guidance Trusstic System™: Trusstic System® Technology integrates Guidance Line® construction for enhanced gait efficiency while providing midfoot structural integrity. Rearfoot and Forefoot Gel® Technology Cushioning System: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. I.G.S® (Impact Guidance System) Technology: Asics design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. Spevafoam™ Midsole Material: Improves bounce back characteristics and decreases midsole breakdown. Outsole AHAR®: Acronym for ASICS High Abrasion Rubber. Placed in critical areas of the outsole for exceptional durability. DuraSponge® Outsole: A blown AHAR® rubber compound for enhanced cushioning and durability in the forefoot. Heel Heel Clutching System™: Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Forefoot Forefoot Gel® Technology Cushioning System: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. Offset Heel Stack Height: 23mm Forefoot Stack Height: 13mm Offset: 10mm Width D Weight N/A ASICS GEL-Nimbus 21 Men's