Extra Spring to Take You FartherAdd more distance to your runs in comfort with the lightweight ASICS GEL-Nimbus 21 running shoe. You’ll benefit from energized cushioning properties thanks to plush responsive FlyteFoam Propel midsole technology that supplies amazing energy return and famous GE technology in the front and rear sole with shock-absorbing silicone for heavy-impact activity.Feel Your Natural GaitSpecial I.G.S (Impact Guidance System) construction allows the GEL-Nimbus 21 to respond to your natural gait while TRUSSTIC SYSTEM technology adds ride stability so you can keep pushing ahead. The gradient jacquard-mesh FluidFit upper adapts to your foot's natural motion and offers additional room in the forefoot. Plush padded collar and tongue give a luxurious feel. Strategically placed overlays offer extra support for a more secure fit. Reflective details help you pop when the light is low. ASICS GEL-Nimbus 21 features:•Synthetic FluidFit® fiber mesh upper for strength and natural flex.•3D printed overlays help to secure the foot.•External heel counter holds your heel firmly in place.•Plush GEL® midsole cushioning offers excellent impact absorption.•FlyteFoam® Propel technology adds high energy return.•Reflective details promote visibility on low-light runs.•High-abrasion-resistance rubber outsole heel plug increases durability.•Rubber outsole provides extra cushioning and traction.