The GEL-Kinsei 6 provides speed and comfort to runners with a close fit and cushioned technology. A GEL cushioning system in the forefoot and rearfoot absorbs the force of impact for a smoother ride, while a FluidRide midsole provides responsive energy return with each step. The shoes are kept stable thanks to a lightweight Propulsion Trusstic system. A vertical flex groove in the outsole enhances gait efficiency by guiding pronators in to the optimal tread pattern.