The Glycerin 21 GTS running she features 2mm of super-soft, nitrogen-infused DNA LOFT v3 cushioning to maximize softness. New, engineered warp knit upper is breathable and allows for a flexible, accomodating fit while staying against your foot. The innovate Guide Rails (GTS) technology supports your body in its natural motion path while keeping excess movement in check. Size 9 medium. Worn slightly, so there is a lot of life left in this shoe. Look like new!