ASICS Women's GEL-Noosa Tri 11 Running Shoe 100% Synthetic Imported Rubber sole Impact guidance system with Asics design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off Rearfoot and forefoot gel cushioning systems attenuates shock during impact and toe-off phases, and allows movement on multiple planes as the foot transitions through the gait cycle Dynamic duomax support system this evolution of duomax system enhances stability and support, with EVA .and SPEVA Features enhanced cushioning and durability Propulsion trusstic mimics connective tissue in the foot by creating tension as foot enters propulsion stage