Triathalon-specific design Easy-on elastic laces Seamless, open mesh construction Dynamic DuoMax Support System Impact Guidance System Perforated Sockliner for after-swim drainage Guidance Line flex grooves AHAR high-abrasion outsole Redesigned seamless mesh and synthetic upper materials. Glow-in-the-dark print livens up each stride! Includes optional elastic laces. Plush tongue and collar for added comfort. Soft fabric lining for a great in-shoe feel. Perforated sockliner promotes enhanced breathability and moisture drainage. 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. 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. Guidance Line® technology employs a vertical flex groove that decouples the tooling along the line of progression for maximum stride efficiency. Wet Grip® outsole is constructed of a mixture of organic and nonorganic compounds, designed to enhance traction on wet surfaces. Imported.