Soft, stylish and snug, the Brooks Glycerin StealthFit 21 gives you everything you need for working out and going out. This plush shoe is optimized for your comfort by being lightweight, responsive, durable and cushioned. The updated knit upper not only looks great but provides a blend of stretch and compression that moves with your feet and fits a bit closer than the traditional Glycerin 21. Details Upper: An updated flat knit upper gives you a closer fit, plenty of style and offers a blend of stretch and compression that moves with your feet. Midsole: the new nitrogen-infused DNA LOFT v3 foam gives you a plush, durable and responsive ride. A broad platform makes sure you have smooth heel-to-toe transitions. Outsole: New RoadTrack rubber on the outsole is lightweight, durable and includes recycled silica.