ASICS Gel Noosa Tri 8 Women's Breathable Light Running Shoes (8) Lightweight, breathable mesh. Durable synthetic overlays. Sew-in tongue with optional elastic laces.Plush tongue and collar for added comfort. Soft fabric lining for a great in-shoe feel.Molded foam insole supplies light underfoot cushioning.Wet Grip outsole is constructed of a mixture of organic and nonorganic compounds, designed to enhance traction on wet surfaces. I.G.S (Impact Guidance System) is an ASICS design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike through toe-off.Guidance Line technology employs a vertical flex groove that decouples the tooling along the line of progression for maximum stride efficiency. Dynamic DuoMax System increases stability and support with reduced weight and enhanced platform comfort.Propulsion Trusstic mimics connective tissues in the foot by creating tension as the foot enters the propulsion phase.