ASICS Women's Gel-Nimbus 18 NYC Running Shoe 100% Synthetic Imported Rubber sole fuzeGEL Midsole: ASICS new GEL cushioning technology made from the fusion of GEL and foam creates lightweight comfort, tuned to provide rearfoot shock absorption that shifts to forefoot bounce back. Rearfoot and Forefoot GEL Cushioning Systems: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. FluidFitUpper: ASICS FluidFit upper technology combines multi-directional stretch mesh with stretch reinforcements that adapt to the athlete's foot, creating a truly customized glove-like fit. Heel Clutching SystemTechnology: Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Seamless Construction: The use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams.