The women's GEL-NIMBUS 21 Running Shoe by ASICS has tons of cushion, support and comfort for longer runs in any weather. Never miss another workout with GEL tech in the front and rear, and the SpEVA insole both absorbing impact. Flytefoam Propel gives bounce and better toe-off with a high energy return. TRUSSTIC System provides stability, with a heel counter and a heel plug al about keeping you in place comfortably. The Impact Guidance System, or I.G.S., allows the shoe to respond to your natural gait.