ASICS GEL-Nimbus 19 The ASICS GEL-Nimbus 19 offers an improved fit with a snug grip on the heel, roomier toe box and extra toe spring. A gradation jacquard mesh Fluidfit upper uses multidirectional, reinforced stretch mesh to match the natural expansion and contraction of your feet as you run. The seamless construction minimizes friction and irritation compared to traditional stitches and seams. With a full length FlyteFoam midsole, the Nimbus is cushioned with organic fibers for a lightweight support system. Integrating guidance line construction with trusstic system technology, these shoes feature a vertical flex groove for enhanced gait efficiency. DuraSponge and AHAR materials combine to create a tough, protective outsole, while rearfoot and forefoot gel cushioning systems prevent fatigue and reduce shock. Thanks to high levels of breathability and antimicrobial properties in the ComforDry lasting and sockliner, you ll stay fresh and comfortable throughout your run.