A racing flat especially for triathletes, the ASICS® GEL-Noosa Tri 6 women's running shoe is designed to be worn barefoot, and it features a breathable mesh upper and a perforated sockliner. Speed laces save time in transition, and Guidance Line™ technology enhances gait efficiency. Key Specs: Model Number:T163N Model Number:T163N Classification:Racing/Specialty Recommended Fit:These shoes run True to Size. Breathability:Yes