Brooks Women's Glycerin StealthFit GTS 21 Running Shoes - White/Grey/Black Color: White/Grey/Black Updated StealthFit flat knit upper offers a blend of stretch and compression that moves with your foot GuideRails holistic support system supports your body in its natural motion path while keeping excess movement in check Made with recycled materials equivalent to 5 plastic water bottles Weight: 8.9 oz Midsole Drop: 10mm